Develop Reference

How to add multiple worksheets in workbook C#

I am trying to generate multiple worksheets for every student in my list but not sure how to achieve this,i can generate Excel document with one worksheet successfully but shows all students in one sheet,how can i generate a new sheet for every student?i tried achieving this with the code below thanks.
public FileContentResult GenerateStudentReport([FromForm] Student Students)
{
int count = 0;
Workbook workbook = new Workbook();
Worksheet worksheet;
foreach (var item in Students)
{
worksheet = workbook.Worksheets[count];
var dataSet = new DataSet();
// Add the new DataTable to the DataSet.
dataSet.Tables.Add(table);
row["studentid"] = Convert.ToString(item.id);
row["studentName"] = Convert.ToString(item.Name);
row["studentSurname"] = Convert.ToString(item.Surname);...
table.Rows.Add(row);
worksheet[count].Import(table, true, 0, 0);
worksheet[count]["A1:V1"].Font.Bold = true;
worksheet[count]["A1:V1"].ColumnWidth = 300;
worksheet[count]["A1:V1"].Style.NumberFormat = "0.00";
worksheet[count].Import(table, true, 0, 0);
count++;
}
byte[] docBytes = workbook.SaveDocument(DocumentFormat.Xlsx);
return File(docBytes, "application/vnd.ms-excel", $"ExportForecastReport_{DateTime.Now.ToString("HH-mm-ss yyyyy-dd-MM")}.xlsx"); // returns a FileStreamResult
}
error thrown while trying to generate second worksheet:{"Worksheet index should be positive and less than the number of worksheets. (Parameter 'index')"}

You should be able to do so with the following:
var newWorksheet = (Excel.Worksheet)this.Application.Worksheets.Add();
The idea is that you first add a new, empty Worksheet to the workbook and then work on it (similarly to what you would do manually in Excel)

You can use EPPlus Nuget package in your project, Then use below code.
public IActionResult EveryExcel([FromForm] Student users)
{
var stream = new MemoryStream();
ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
using (var xlPackage = new ExcelPackage(stream))
{
int i = 1;
foreach(var user in users)
{
var worksheet = xlPackage.Workbook.Worksheets.Add($"StudentAll{i}");
var namedStyle = xlPackage.Workbook.Styles.CreateNamedStyle($"HyperLink{i}");
namedStyle.Style.Font.UnderLine = true;
namedStyle.Style.Font.Color.SetColor(Color.Blue);
const int startRow = 5;
var row = startRow;
worksheet.Cells["A1"].Value = "Sample";
using (var r = worksheet.Cells["A1:C1"])
{
r.Merge = true;
r.Style.Font.Color.SetColor(Color.White);
r.Style.HorizontalAlignment = OfficeOpenXml.Style.ExcelHorizontalAlignment.CenterContinuous;
r.Style.Fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
r.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(23, 55, 93));
}
worksheet.Cells["A4"].Value = "ID";
worksheet.Cells["B4"].Value = "Name";
worksheet.Cells["C4"].Value = "Surname";
worksheet.Cells["A4:C4"].Style.Fill.PatternType = ExcelFillStyle.Solid;
worksheet.Cells["A4:C4"].Style.Fill.BackgroundColor.SetColor(Color.FromArgb(184, 204, 228));
worksheet.Cells["A4:C4"].Style.Font.Bold = true;
worksheet.Cells[row, 1].Value = user.Id;
worksheet.Cells[row, 2].Value = user.Name;
worksheet.Cells[row, 3].Value = user.Surname;
i++;
}
xlPackage.Save();
}
stream.Position = 0;
return File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "students.xlsx");
}
Then it will generate a new sheet for every student

How to add pivot table filters with Microsoft.Office.Interop.Excel in C#

I create a pivot table based on an Excel (.xlsx) file. The program adds fields to rows, values, and the filter. Using PivotFilters.Add2 causes 0x800a03ec error which terminates the program. How to properly use PivotFilters.Add2?
I tried filtering on different fields with different data types. Also, I tried using Type.Missing in a place of unused arguments. There seems to be plenty of information of this method for VB, but not so much for C#.
Items selected in the filter should be between the two dates on the last line.
var xlApp = new Microsoft.Office.Interop.Excel.Application();
xlApp.Visible = true;
var workBook = xlApp.Workbooks.Open(spreadsheetLocation);
var workSheet1 = (Microsoft.Office.Interop.Excel.Worksheet)workBook.Sheets["Data"];
var workSheet2 = (Microsoft.Office.Interop.Excel.Worksheet)workBook.Sheets.Add();
Microsoft.Office.Interop.Excel.Range last = workSheet1.Cells.SpecialCells(Microsoft.Office.Interop.Excel.XlCellType.xlCellTypeLastCell, Type.Missing);
Microsoft.Office.Interop.Excel.Range range = workSheet1.get_Range("A1", last);
Microsoft.Office.Interop.Excel.PivotCaches pivotCaches = null;
Microsoft.Office.Interop.Excel.PivotCache pivotCache = null;
Microsoft.Office.Interop.Excel.PivotTable pivotTable = null;
Microsoft.Office.Interop.Excel.PivotFields pivotFields = null;
Microsoft.Office.Interop.Excel.PivotField filterField = null;
Microsoft.Office.Interop.Excel.PivotField accNumField = null;
Microsoft.Office.Interop.Excel.PivotField amountPaidField = null;
pivotCaches = workBook.PivotCaches();
pivotCache = pivotCaches.Create(XlPivotTableSourceType.xlDatabase, range);
pivotTable = pivotCache.CreatePivotTable(workSheet2.Cells[1,1]);
pivotFields = (Microsoft.Office.Interop.Excel.PivotFields)pivotTable.PivotFields();
amountPaidField = (Microsoft.Office.Interop.Excel.PivotField)pivotFields.Item("AmountPaid");
amountPaidField.Orientation = Microsoft.Office.Interop.Excel.XlPivotFieldOrientation.xlDataField;
amountPaidField.NumberFormat = "$#,###,###.00";
accNumField = (Microsoft.Office.Interop.Excel.PivotField)pivotFields.Item("AccNumber");
accNumField.Orientation = Microsoft.Office.Interop.Excel.XlPivotFieldOrientation.xlRowField;
filterField = (Microsoft.Office.Interop.Excel.PivotField)pivotFields.Item("AccDate");
filterField.Orientation = Microsoft.Office.Interop.Excel.XlPivotFieldOrientation.xlPageField;
filterField.EnableMultiplePageItems = true;
filterField.PivotFilters.Add2(XlPivotFilterType.xlDateBetween, Type.Missing, DateTime.Now.AddDays(-30), DateTime.Now.AddDays(-20));

#First it deletes two rows and then it creates a pivot table#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Office.Interop.Excel;
namespace ConsoleApplication4
{
class Program
{
public static string Column(int column)
{
column--;
if (column >= 0 && column < 26)
return ((char)('A' + column)).ToString();
else if (column > 25)
return Column(column / 26) + Column(column % 26 + 1);
else
throw new Exception("Invalid Column #" + (column + 1).ToString());
}
static void Main(string[] args)
{
try
{
string path = #"C:\Users\UX155512\Documents\Book1fd.xlsx";
var excelFile = new Application();
Workbook workBook = excelFile.Workbooks.Open(path);
Worksheet workSheet = workBook.Worksheets[1];
Worksheet pivotSheet = workBook.Worksheets.Add(
System.Reflection.Missing.Value,
workBook.Worksheets[workBook.Worksheets.Count],
1,
System.Reflection.Missing.Value);
Range last = workSheet.Cells.SpecialCells(XlCellType.xlCellTypeLastCell, Type.Missing);
int lastRow = last.Row;
int lastCol = last.Column;
string lastColVal = Column(lastCol);
string lastFilledCol = lastColVal + lastRow.ToString();
Console.WriteLine(lastFilledCol);
Console.WriteLine(lastColVal);
Console.WriteLine(lastRow);
Console.WriteLine(lastCol);
for (int i = 1; i <= lastRow; i++)
{
if (workSheet.Cells[1][i].Value == ("HDR"))
{
workSheet.Rows[i].Delete();
Console.WriteLine("The Row Containing HDR has been deleted");
}
if (workSheet.Cells[1][i].Value == ("TRL"))
{
workSheet.Rows[i].Delete();
Console.WriteLine("The Row Containing TLR has been deleted");
}
}
Range lastRange = workSheet.Range["A1", lastFilledCol];
pivotSheet.Name = "Pivot Table";
Range range = pivotSheet.Cells[1, 1];
PivotCache pivotCache = (PivotCache)workBook.PivotCaches().Add(XlPivotTableSourceType.xlDatabase, lastRange);
PivotTable pivotTable = (PivotTable)pivotSheet.PivotTables().Add(PivotCache: pivotCache, TableDestination: range);
PivotField pivotField = (PivotField)pivotTable.PivotFields("Plan Number");
pivotField.Orientation = XlPivotFieldOrientation.xlRowField;
PivotField pivotField2 = (PivotField)pivotTable.PivotFields("Source");
pivotField2.Orientation = XlPivotFieldOrientation.xlColumnField;
PivotField pivotField3 = (PivotField)pivotTable.PivotFields("Total");
pivotField3.Orientation = XlPivotFieldOrientation.xlDataField;
pivotField3.Function = XlConsolidationFunction.xlSum;
workBook.SaveAs(#"C:\Users\UX155512\Documents\Excel Dump\Trial9.xlsx");
workBook.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
Console.Read();
}
}
}

As mentioned above by Asger, the filter can't be added to a page field. Instead, the pivot item's visibility property has to be set.
var pivotItems = filterField.PivotItems();
DateTime date = Convert.ToDateTime(item.Name);
foreach (var item in pivotItems)
{
item.Visible = false;
if (date < DateTime.Now.AddDays(-30) || date > DateTime.Now.AddDays(-20))
{
item.Visible = true;
}
}

The best way to find the answer to pretty much ANY interop question is to record a macro then examine the source.

Some data is missing in the Export to Excel using DataTable and Linq

I am exporting three worked sheet in single XL file, but I am missing some user data in the second DataTable (Education Details sheet) and third DataTable (Employeement Details sheet).
The Education Details sheet is some users are not there, but an Employeement Details sheet that users are showing. User Email Id's is there all three Database Tables.
DataSe ds = new DataSet();
DataTable dt = new DataTable("Registration Details");
DataTable dt1 = new DataTable("Education Details");
DataTable dt2 = new DataTable("Employeement Details");
dt = bl.Get_Registrationdetailsbydate(bo);
gv_Regdetails.DataSource = dt;
gv_Regdetails.DataBind();
dt1 = bl.Get_Registrationdetailsbydate1(bo);
dt2 = bl.Get_Registrationdetailsbydate2(bo);
DataTable filteredEducation = dt1.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim() == x.Field<string>("Email").Trim()))
.CopyToDataTable();
DataTable filteredEmployee = dt2.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim() == x.Field<string>("Email").Trim()))
.CopyToDataTable();
dt.TableName = "Registration Details";
filteredEducation.TableName = "Education Details";
filteredEmployee.TableName = "Employeement Details";
ds.Tables.Add(dt);
ds.Tables.Add(filteredEducation);
ds.Tables.Add(filteredEmployee);
ExcelHelper.ToExcel(ds, "DangoteUsers.xls", Page.Response);
I did result base on first DataTable users Email, then fill second DataTable detail users base on first DataTable Email id's. Same as Employment Details. The issue in first DataTable and second DataTable. I am not returning the DataTable also.
I refer this example

The problem is coming somewhere from the solution of conversion from DataSet to Excel in the article. Using this self made conversion is not a good idea. Use Jet/ACE engine or Microsoft Office Interop. At least they guarantee, they don't have such kind of bugs, which in future can became more. Better use something which is already highly accepted by the community. Here I wrote an approach how to do it with Interop.
First what you need to do is to add the reference to Microsoft.Office.Interop.Excel. Here is how to do it, taken from msdn article
Add the Excel assembly as a reference to the project: Right-click on
the project, select Add Reference.
Click the COM tab of the Add Reference dialog box, and find Microsoft
Excel 11 Object Library.
Double-click on Microsoft Excel 11 Object Library, and
press OK.
Obviously if you have bigger version of Excel 11 use it.
Here is the code, there are comments/regions with the workflow of it. You should use using Excel = Microsoft.Office.Interop.Excel; as reference
public void ExcelBtn_Click(object sender, EventArgs e)
{
DataSet dst = PrepareData();
byte[] bytes = ExportDataSetToExcel(dst);
Response.ClearContent();
Response.ContentType = "application/msoffice";
Response.AddHeader("Content-Disposition", #"attachment; filename=""ExportedExcel.xlsx"" ");
Response.BinaryWrite(bytes);
Response.End();
}
public static DataSet PrepareData()
{
DataTable badBoysDst = new DataTable("BadBoys");
badBoysDst.Columns.Add("Nr");
badBoysDst.Columns.Add("Name");
badBoysDst.Rows.Add(1, "Me");
badBoysDst.Rows.Add(2, "You");
badBoysDst.Rows.Add(3, "Pepe");
badBoysDst.Rows.Add(4, "Roni");
//Create a Department Table
DataTable goodBoysDst = new DataTable("GoodBoys");
goodBoysDst.Columns.Add("Nr");
goodBoysDst.Columns.Add("Name");
goodBoysDst.Rows.Add("1", "Not me");
goodBoysDst.Rows.Add("2", "Not you");
goodBoysDst.Rows.Add("3", "Quattro");
goodBoysDst.Rows.Add("4", "Stagioni");
DataTable goodBoysDst2 = new DataTable("GoodBoys2");
goodBoysDst2.Columns.Add("Nr");
goodBoysDst2.Columns.Add("Name");
goodBoysDst2.Rows.Add("1", "Not me");
goodBoysDst2.Rows.Add("2", "Not you");
goodBoysDst2.Rows.Add("3", "Quattro");
goodBoysDst2.Rows.Add("4", "Stagioni");
DataTable goodBoysDst3 = new DataTable("GoodBoys3");
goodBoysDst3.Columns.Add("Nr");
goodBoysDst3.Columns.Add("Name");
goodBoysDst3.Rows.Add("1", "Not me");
goodBoysDst3.Rows.Add("2", "Not you");
goodBoysDst3.Rows.Add("3", "Quattro");
goodBoysDst3.Rows.Add("4", "Stagioni");
//Create a DataSet with the existing DataTables
DataSet dst = new DataSet("SchoolBoys");
dst.Tables.Add(badBoysDst);
dst.Tables.Add(goodBoysDst);
dst.Tables.Add(goodBoysDst2);
dst.Tables.Add(goodBoysDst3);
return dst;
}
public static byte[] ExportDataSetToExcel(DataSet dst)
{
#region Create The Excel
Excel.Application excelApp = null;
Excel.Workbook excelWorkBook = null;
try
{
excelApp = new Excel.Application();
if (excelApp == null)
throw new Exception("You can throw custom exception here too");
excelWorkBook = excelApp.Workbooks.Add();
int sheetNr = 1;
foreach (DataTable table in dst.Tables)
{
Excel.Worksheet excelWorkSheet = null;
//Add a new worksheet or reuse first 3 sheets of workbook with the Datatable name
if (sheetNr <= excelWorkBook.Sheets.Count)
{
excelWorkSheet = excelWorkBook.Sheets.get_Item(sheetNr);
}
else
{
excelWorkSheet = excelWorkBook.Sheets.Add(After: excelWorkBook.Sheets[excelWorkBook.Sheets.Count]);
}
excelWorkSheet.Name = table.TableName;
for (int i = 1; i < table.Columns.Count + 1; i++)
{
excelWorkSheet.Cells[1, i] = table.Columns[i - 1].ColumnName;
}
for (int j = 0; j < table.Rows.Count; j++)
{
for (int k = 0; k < table.Columns.Count; k++)
{
excelWorkSheet.Cells[j + 2, k + 1] = table.Rows[j].ItemArray[k].ToString();
}
}
sheetNr += 1;
}
//make first sheet active
excelApp.ActiveWorkbook.Sheets[1].Select();
excelWorkBook.SaveAs(#"c:\temp\DataSetToExcel.xlsx");
}
finally
{
excelWorkBook.Close();
excelApp.Quit();
//you should call GC here because there is memory problem with Interop
GC.Collect();
GC.WaitForPendingFinalizers();
}
#endregion
#region Take byte[] of the excel
byte[] result = null;
using (FileStream fs = new FileStream(#"c:\temp\DataSetToExcel.xlsx", FileMode.Open, FileAccess.Read))
{
BinaryReader reader = new BinaryReader(fs);
result = reader.ReadBytes((int)fs.Length);
}
#endregion
#region Delete the excel from the server
File.Delete(#"c:\temp\DataSetToExcel.xlsx");
#endregion
return result;
}
}
So try to use something established by the community already.This is pretty much full example how to do it with Interop. Personally I prefer to use ACE/JET engines, because there is no memory leaks problems like in the Interop(because of that we are calling the GC in the code). Creation of new sheets with ACE/JET engine is a little bit harder.

I think your string comparison in linq query is a problem..your email address might have different case which could have caused this issue. Try below code
DataTable filteredEducation = dt1.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim().Equals(x.Field<string>("Email").Trim(),StringComparison.CurrentCultureIgnoreCase)))
.CopyToDataTable();
DataTable filteredEmployee = dt2.AsEnumerable()
.Where(x => dt.AsEnumerable()
.Any(z => z.Field<string>("Email").Trim().Equals(x.Field<string>("Email").Trim(),StringComparison.CurrentCultureIgnoreCase)))
.CopyToDataTable();

I had done the same export problem by manual export. First, i need to prepare a responce http responce properly, than add all headers(with rowsapn and colspan attributes) of your tables and then populate data:
//this fun is called after click on export button for example
public void Export(string fileName, GridView gv)
{
try
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", String.Format("{0}.xls", fileName)));
HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "utf-8");
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.Write(#"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">");
HttpContext.Current.Response.Charset = "utf-8";//"windows-1251";//
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
// Create a table to contain the grid
Table table = new Table();
table.Width = Unit.Percentage(100);
// include the gridline settings
table.GridLines = gv.GridLines;
//header
TableRow r = new TableRow();
TableCell cell = new TableCell()
{
ColumnSpan = 18,
Text = fileName,
BackColor = Color.LightGray,
HorizontalAlign = HorizontalAlign.Center
};
cell.Font.Size = new FontUnit(14);
r.Cells.Add(cell);
table.Rows.Add(r);
GridViewRow row;
int rowSpan = 0;
//second row
row = CreateSecondHeaderRow();
table.Rows.AddAt(1, row);
//first row
row = CreateFirstHeaderRow(row, rowSpan);
table.Rows.AddAt(1, row);
// add each of the data rows to the table
for (int j = 0; j < gv.Rows.Count; j++)
{
//Set the default color
gv.Rows[j].BackColor = System.Drawing.Color.White;
for (int i = 0; i < gv.Rows[j].Cells.Count; i++)
{
gv.Rows[j].Cells[i].BackColor = System.Drawing.Color.White;
gv.Rows[j].Cells[i].Width = gv.Columns[i].ItemStyle.Width;
gv.Rows[j].Cells[i].Font.Size = gv.Columns[i].ItemStyle.Font.Size;
gv.Rows[j].Cells[i].Font.Bold = gv.Columns[i].ItemStyle.Font.Bold;
gv.Rows[j].Cells[i].Font.Italic = gv.Columns[i].ItemStyle.Font.Italic;
//aligh
if (i == 0)
{
gv.Rows[j].Cells[i].Style["text-align"] = "center";
}
else
{
gv.Rows[j].Cells[i].Style["text-align"] = "right";
}
//for alternate
if (j % 2 != 1) gv.Rows[j].Cells[i].BackColor = Color.LightSteelBlue;
}
table.Rows.Add(gv.Rows[j]);
}
table.RenderControl(htw);
// render the htmlwriter into the response
HttpContext.Current.Response.Write(sw);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}
}
}
catch (Exception ex)
{
this._hasError = true;
ShowError(ex);
}
}
private TableHeaderCell CreateHeaderCell(string text = null, int rowSpan = 0, int columnSpan = 0, Color backColor = default(Color), Color foreColor = default(Color))
{
if (object.Equals(backColor, default(Color))) backColor = Color.LightGray;
if (object.Equals(foreColor, default(Color))) foreColor = Color.Black;
return new TableHeaderCell
{
RowSpan = rowSpan,
ColumnSpan = columnSpan,
Text = text,
BackColor = backColor
};
}
private GridViewRow CreateFirstHeaderRow(GridViewRow row, int rowSpan)
{
row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);
TableHeaderCell cell = CreateHeaderCell("Surplus %");
row.Controls.Add(cell);
cell = CreateHeaderCell("The date", columnSpan: 2);
row.Controls.Add(cell);
if (this.WithQuantity)
{
cell = CreateHeaderCell("Total Quantity", 2 + rowSpan, backColor: Color.Yellow);
row.Controls.Add(cell);
}
cell = CreateHeaderCell("Total Amount", 2 + rowSpan);
row.Controls.Add(cell);
cell = CreateHeaderCell("Has elapsed periods from start", columnSpan: (this.WithQuantity ? (SurplusUtil.TheColumnsNumbers * 2) : SurplusUtil.TheColumnsNumbers));
row.Controls.Add(cell);
if (this.WithQuantity)
{
cell = CreateHeaderCell("Quantity <br style='mso-data-placement:same-cell;' /> surplus", 2 + rowSpan, backColor: Color.Yellow);
row.Controls.Add(cell);
}
cell = CreateHeaderCell("Principal <br style='mso-data-placement:same-cell;' /> surplus", 2 + rowSpan);
row.Controls.Add(cell);
return row;
}
private GridViewRow CreateSecondHeaderRow()
{
GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Insert);
TableHeaderCell cell = CreateHeaderCell("Period number", rowSpan: ((this.WithQuantity) ? 2 : 0));
row.Controls.Add(cell);
cell = CreateHeaderCell("from", rowSpan: ((this.WithQuantity) ? 2 : 0));
row.Controls.Add(cell);
cell = CreateHeaderCell("to", rowSpan: ((this.WithQuantity) ? 2 : 0));
row.Controls.Add(cell);
for (int i = 0; i < SurplusUtil.TheColumnsNumbers; i++)
{
cell = CreateHeaderCell(i.ToString(),
columnSpan: ((this.WithQuantity) ? 2 : 0),
backColor: System.Drawing.Color.FromArgb(198, 239, 206),
foreColor: System.Drawing.Color.FromArgb(0, 97, 0));
row.Controls.Add(cell);
}
return row;
}

Export to Excel using Open XML. But Last cell not filling up

I used this code snippet to export data to Excel using Open XML.
The code was in VB.Net so I converted it to C#. It's working fine with only one (annoying) glitch. The last cell (Z5) is blank. When I used the VB.Net version it's filling all the cells. I manually compared the C# vs the VB.Net code but it's functionally similar byte by byte. But still it's not able to fill up the last cell. Any idea why?
C# version of the code is below for your reference:
protected void Export()
{
Response.ClearHeaders();
Response.ClearContent();
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml";
//"application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" '"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" '"application/vnd.ms-excel"
Response.AddHeader("content-disposition", "attachment; filename=Test.xlsx");
Response.Charset = "";
this.EnableViewState = false;
MemoryStream ms = new MemoryStream();
SpreadsheetDocument objSpreadsheet = SpreadsheetDocument.Create(ms, SpreadsheetDocumentType.Workbook);
WorkbookPart objWorkbookPart = objSpreadsheet.AddWorkbookPart();
objWorkbookPart.Workbook = new Workbook();
WorksheetPart objSheetPart = objWorkbookPart.AddNewPart<WorksheetPart>();
objSheetPart.Worksheet = new Worksheet(new SheetData());
Sheets objSheets = objSpreadsheet.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());
Sheet objSheet = new Sheet();
objSheet.Id = objSpreadsheet.WorkbookPart.GetIdOfPart(objSheetPart);
objSheet.SheetId = 1;
objSheet.Name = "mySheet";
objSheets.Append(objSheet);
for (int intRow = (int)('A'); intRow <= (int)('Z'); intRow++)
{
for (uint intCol = 1; intCol <= 5; intCol++)
{
Cell objCell = InsertCellInWorksheet(Convert.ToString((char)intRow), intCol, objSheetPart);
objCell.CellValue = new CellValue("This was a test: " + Convert.ToString((char)intRow) + intCol.ToString());
objCell.DataType = new EnumValue<CellValues>(CellValues.String);
objSpreadsheet.WorkbookPart.Workbook.Save();
}
}
objSpreadsheet.WorkbookPart.Workbook.Save();
objSpreadsheet.Close();
ms.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
private static Cell InsertCellInWorksheet(string columnName, uint rowIndex, WorksheetPart worksheetPart)
{
Worksheet worksheet = worksheetPart.Worksheet;
var sheetData = worksheet.GetFirstChild<SheetData>();
string cellReference = columnName + rowIndex;
// If the worksheet does not contain a row with the specified row index, insert one.
Row row;
if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
{
row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
}
else
{
row = new Row { RowIndex = rowIndex };
sheetData.Append(row);
}
// If there is not a cell with the specified column name, insert one.
if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
{
return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
}
// Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
Cell refCell = row.Elements<Cell>().FirstOrDefault(cell => string.Compare(cell.CellReference.Value, cellReference, true) > 0);
var newCell = new Cell { CellReference = cellReference };
row.InsertBefore(newCell, refCell);
worksheet.Save();
return newCell;
}

Issue is resolved. I made a small change to the code to make it work. Instead of saving the sheet inside InsertCellInWorksheet method. I am saving the sheet outside the for loops. Here is the working version of the code.
protected void Export()
{
Response.ClearHeaders();
Response.ClearContent();
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml";
//"application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" '"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" '"application/vnd.ms-excel"
Response.AddHeader("content-disposition", "attachment; filename=Test.xlsx");
Response.Charset = "";
this.EnableViewState = false;
MemoryStream ms = new MemoryStream();
SpreadsheetDocument objSpreadsheet = SpreadsheetDocument.Create(ms, SpreadsheetDocumentType.Workbook);
WorkbookPart objWorkbookPart = objSpreadsheet.AddWorkbookPart();
objWorkbookPart.Workbook = new Workbook();
WorksheetPart objSheetPart = objWorkbookPart.AddNewPart<WorksheetPart>();
objSheetPart.Worksheet = new Worksheet(new SheetData());
Sheets objSheets = objSpreadsheet.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());
Sheet objSheet = new Sheet();
objSheet.Id = objSpreadsheet.WorkbookPart.GetIdOfPart(objSheetPart);
objSheet.SheetId = 1;
objSheet.Name = "mySheet";
objSheets.Append(objSheet);
for (int intRow = (int)('A'); intRow <= (int)('Z'); intRow++)
{
for (uint intCol = 1; intCol <= 5; intCol++)
{
Cell objCell = InsertCellInWorksheet(Convert.ToString((char)intRow), intCol, objSheetPart);
objCell.CellValue = new CellValue("This was a test: " + Convert.ToString((char)intRow) + intCol.ToString());
objCell.DataType = new EnumValue<CellValues>(CellValues.String);
}
}
objSheetPart.Worksheet.Save();
objSpreadsheet.WorkbookPart.Workbook.Save();
objSpreadsheet.Close();
ms.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
private static Cell InsertCellInWorksheet(string columnName, uint rowIndex, WorksheetPart worksheetPart)
{
Worksheet worksheet = worksheetPart.Worksheet;
var sheetData = worksheet.GetFirstChild<SheetData>();
string cellReference = columnName + rowIndex;
// If the worksheet does not contain a row with the specified row index, insert one.
Row row;
if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
{
row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
}
else
{
row = new Row { RowIndex = rowIndex };
sheetData.Append(row);
}
// If there is not a cell with the specified column name, insert one.
if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
{
return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
}
// Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
Cell refCell = row.Elements<Cell>().FirstOrDefault(cell => string.Compare(cell.CellReference.Value, cellReference, true) > 0);
var newCell = new Cell { CellReference = cellReference };
row.InsertBefore(newCell, refCell);
//worksheet.Save();
return newCell;
}
Not sure how it worked in VB.Net :-)

The loop through the rows and columns that you have doesn't look right. It looks like you are looping from row = 65 (i.e. (int)('A') to row = 65 + 26 (i.e. (int)('Z')) and then col = 1 to 3.
Maybe you should loop from col = 1 to 5.
I think you possibly need to have a look at the xml you are dealing with and make sure you are moving through the document (rows and columns) correctly. If you weren't aware of it all office 2007 and later documents are openXml document. They are basically zip files that contain xml. If you take your spreadsheet and change the extension from .xlsx to .zip you will be able to open the document as a zip file and browse the contents. I haven't worked with openXml for over a year, but if my memory serves me correctly you will find the xml representing the sheets in the sheets folder.

How to read data of an Excel file using C#?

How to read an Excel file using C#? I open an Excel file for reading and copy it to clipboard to search email format, but I don't know how to do it.
FileInfo finfo;
Excel.ApplicationClass ExcelObj = new Excel.ApplicationClass();
ExcelObj.Visible = false;
Excel.Workbook theWorkbook;
Excel.Worksheet worksheet;
if (listView1.Items.Count > 0)
{
foreach (ListViewItem s in listView1.Items)
{
finfo = new FileInfo(s.Text);
if (finfo.Extension == ".xls" || finfo.Extension == ".xlsx" || finfo.Extension == ".xlt" || finfo.Extension == ".xlsm" || finfo.Extension == ".csv")
{
theWorkbook = ExcelObj.Workbooks.Open(s.Text, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, false, false);
for (int count = 1; count <= theWorkbook.Sheets.Count; count++)
{
worksheet = (Excel.Worksheet)theWorkbook.Worksheets.get_Item(count);
worksheet.Activate();
worksheet.Visible = false;
worksheet.UsedRange.Cells.Select();
}
}
}
}

OK,
One of the more difficult concepts to grasp about Excel VSTO programming is that you don't refer to cells like an array, Worksheet[0][0] won't give you cell A1, it will error out on you. Even when you type into A1 when Excel is open, you are actually entering data into Range A1. Therefore you refer to cells as Named Ranges. Here's an example:
Excel.Worksheet sheet = workbook.Sheets["Sheet1"] as Excel.Worksheet;
Excel.Range range = sheet.get_Range("A1", Missing.Value)
You can now literally type:
range.Text // this will give you the text the user sees
range.Value2 // this will give you the actual value stored by Excel (without rounding)
If you want to do something like this:
Excel.Range range = sheet.get_Range("A1:A5", Missing.Value)
if (range1 != null)
foreach (Excel.Range r in range1)
{
string user = r.Text
string value = r.Value2
}
There might be a better way, but this has worked for me.
The reason you need to use Value2 and not Value is because the Value property is a parametrized and C# doesn't support them yet.
As for the cleanup code, i will post that when i get to work tomorrow, i don't have the code with me, but it's very boilerplate. You just close and release the objects in the reverse order you created them. You can't use a Using() block because the Excel.Application or Excel.Workbook doesn't implement IDisposable, and if you don't clean-up, you will be left with a hanging Excel objects in memory.
Note:
If you don't set the Visibility property Excel doesn't display, which can be disconcerting to your users, but if you want to just rip the data out, that is probably good enough
You could OleDb, that will work too.
I hope that gets you started, let me know if you need further clarification. I'll post a complete
here is a complete sample:
using System;
using System.IO;
using System.Reflection;
using NUnit.Framework;
using ExcelTools = Ms.Office;
using Excel = Microsoft.Office.Interop.Excel;
namespace Tests
{
[TestFixture]
public class ExcelSingle
{
[Test]
public void ProcessWorkbook()
{
string file = #"C:\Users\Chris\Desktop\TestSheet.xls";
Console.WriteLine(file);
Excel.Application excel = null;
Excel.Workbook wkb = null;
try
{
excel = new Excel.Application();
wkb = ExcelTools.OfficeUtil.OpenBook(excel, file);
Excel.Worksheet sheet = wkb.Sheets["Data"] as Excel.Worksheet;
Excel.Range range = null;
if (sheet != null)
range = sheet.get_Range("A1", Missing.Value);
string A1 = String.Empty;
if( range != null )
A1 = range.Text.ToString();
Console.WriteLine("A1 value: {0}", A1);
}
catch(Exception ex)
{
//if you need to handle stuff
Console.WriteLine(ex.Message);
}
finally
{
if (wkb != null)
ExcelTools.OfficeUtil.ReleaseRCM(wkb);
if (excel != null)
ExcelTools.OfficeUtil.ReleaseRCM(excel);
}
}
}
}
I'll post the functions from ExcelTools tomorrow, I don't have that code with me either.
Edit:
As promised, here are the Functions from ExcelTools you might need.
public static Excel.Workbook OpenBook(Excel.Application excelInstance, string fileName, bool readOnly, bool editable,
bool updateLinks) {
Excel.Workbook book = excelInstance.Workbooks.Open(
fileName, updateLinks, readOnly,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, editable, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing);
return book;
}
public static void ReleaseRCM(object o) {
try {
System.Runtime.InteropServices.Marshal.ReleaseComObject(o);
} catch {
} finally {
o = null;
}
}
To be frank, this stuff is much easier if you use VB.NET. It's in C# because I didn't write it. VB.NET does option parameters well, C# does not, hence the Type.Missing. Once you typed Type.Missing twice in a row, you run screaming from the room!
As for you question, you can try to following:
http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel.range.find(VS.80).aspx
I will post an example when I get back from my meeting... cheers
Edit: Here is an example
range = sheet.Cells.Find("Value to Find",
Type.Missing,
Type.Missing,
Type.Missing,
Type.Missing,
Excel.XlSearchDirection.xlNext,
Type.Missing,
Type.Missing, Type.Missing);
range.Text; //give you the value found
Here is another example inspired by this site:
range = sheet.Cells.Find("Value to find", Type.Missing, Type.Missing,Excel.XlLookAt.xlWhole,Excel.XlSearchOrder.xlByColumns,Excel.XlSearchDirection.xlNext,false, false, Type.Missing);
It helps to understand the parameters.
P.S. I'm one of those weird people who enjoys learning COM automation. All this code steamed from a tool I wrote for work which required me to process over 1000+ spreadsheets from the lab each Monday.

You can use Microsoft.Office.Interop.Excel assembly to process excel files.
Right click on your project and go to Add reference. Add the
Microsoft.Office.Interop.Excel assembly.
Include using
Microsoft.Office.Interop.Excel; to make use of assembly.
Here is the sample code:
using Microsoft.Office.Interop.Excel;
//create the Application object we can use in the member functions.
Microsoft.Office.Interop.Excel.Application _excelApp = new Microsoft.Office.Interop.Excel.Application();
_excelApp.Visible = true;
string fileName = "C:\\sampleExcelFile.xlsx";
//open the workbook
Workbook workbook = _excelApp.Workbooks.Open(fileName,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing);
//select the first sheet
Worksheet worksheet = (Worksheet)workbook.Worksheets[1];
//find the used range in worksheet
Range excelRange = worksheet.UsedRange;
//get an object array of all of the cells in the worksheet (their values)
object[,] valueArray = (object[,])excelRange.get_Value(
XlRangeValueDataType.xlRangeValueDefault);
//access the cells
for (int row = 1; row <= worksheet.UsedRange.Rows.Count; ++row)
{
for (int col = 1; col <= worksheet.UsedRange.Columns.Count; ++col)
{
//access each cell
Debug.Print(valueArray[row, col].ToString());
}
}
//clean up stuffs
workbook.Close(false, Type.Missing, Type.Missing);
Marshal.ReleaseComObject(workbook);
_excelApp.Quit();
Marshal.FinalReleaseComObject(_excelApp);

Why don't you create OleDbConnection? There are a lot of available resources in the Internet. Here is an example
OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+filename+";Extended Properties=Excel 8.0");
con.Open();
try
{
//Create Dataset and fill with imformation from the Excel Spreadsheet for easier reference
DataSet myDataSet = new DataSet();
OleDbDataAdapter myCommand = new OleDbDataAdapter(" SELECT * FROM ["+listname+"$]" , con);
myCommand.Fill(myDataSet);
con.Close();
richTextBox1.AppendText("\nDataSet Filled");
//Travers through each row in the dataset
foreach (DataRow myDataRow in myDataSet.Tables[0].Rows)
{
//Stores info in Datarow into an array
Object[] cells = myDataRow.ItemArray;
//Traverse through each array and put into object cellContent as type Object
//Using Object as for some reason the Dataset reads some blank value which
//causes a hissy fit when trying to read. By using object I can convert to
//String at a later point.
foreach (object cellContent in cells)
{
//Convert object cellContect into String to read whilst replacing Line Breaks with a defined character
string cellText = cellContent.ToString();
cellText = cellText.Replace("\n", "|");
//Read the string and put into Array of characters chars
richTextBox1.AppendText("\n"+cellText);
}
}
//Thread.Sleep(15000);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
//Thread.Sleep(15000);
}
finally
{
con.Close();
}

try
{
DataTable sheet1 = new DataTable("Excel Sheet");
OleDbConnectionStringBuilder csbuilder = new OleDbConnectionStringBuilder();
csbuilder.Provider = "Microsoft.ACE.OLEDB.12.0";
csbuilder.DataSource = fileLocation;
csbuilder.Add("Extended Properties", "Excel 12.0 Xml;HDR=YES");
string selectSql = #"SELECT * FROM [Sheet1$]";
using (OleDbConnection connection = new OleDbConnection(csbuilder.ConnectionString))
using (OleDbDataAdapter adapter = new OleDbDataAdapter(selectSql, connection))
{
connection.Open();
adapter.Fill(sheet1);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
This worked for me. Please try it and let me know for queries.

First of all, it's important to know what you mean by "open an Excel file for reading and copy it to clipboard..."
This is very important because there are many ways you could do that depending just on what you intend to do. Let me explain:
If you want to read a set of data and copy that in the clipboard and you know the data format (e.g. column names), I suggest you use an OleDbConnection to open the file, this way you can treat the xls file content as a Database Table, so you can read data with SQL instruction and treat the data as you want.
If you want to do operations on the data with the Excel object model then open it in the way you began.
Some time it's possible to treat an xls file as a kind of csv file, there are tools like File Helpers which permit you to treat and open an xls file in a simple way by mapping a structure on an arbitrary object.
Another important point is in which Excel version the file is.
I have, unfortunately I say, a strong experience working with Office automation in all ways, even if bounded in concepts like Application Automation, Data Management and Plugins, and generally I suggest only as the last resort, to using Excel automation or Office automation to read data; just if there aren't better ways to accomplish that task.
Working with automation could be heavy in performance, in terms of resource cost, could involve in other issues related for example to security and more, and last but not at least, working with COM interop it's not so "free"..
So my suggestion is think and analyze the situation within your needs and then take the better way.

Here's a 2020 answer - if you don't need to support the older .xls format (so pre 2003) you could use either:
LightweightExcelReader to access specfic cells, or cursor through all the data in a spreadsheet.
or
ExcelToEnumerable if you want to map spreadsheet data to a list of objects.
Pros :
Performance - at the time of writing (the the fastest way to read an .xlsx file)[https://github.com/ChrisHodges/ExcelToEnumerable#performance].
Simplicity - less verbose than OLE DB or OpenXml
Cons:
Neither LightweightExcelReader nor ExcelToEnumerable support .xls files.
Disclaimer: I am the author of LightweightExcelReader and ExcelToEnumerable

Use Open XML.
Here is some code to process a spreadsheet with a specific tab or sheet name and dump it to something like CSV. (I chose a pipe instead of comma).
I wish it was easier to get the value from a cell, but I think this is what we are stuck with. You can see that I reference the MSDN documents where I got most of this code. That is what Microsoft recommends.
/// <summary>
/// Got code from: https://msdn.microsoft.com/en-us/library/office/gg575571.aspx
/// </summary>
[Test]
public void WriteOutExcelFile()
{
var fileName = "ExcelFiles\\File_With_Many_Tabs.xlsx";
var sheetName = "Submission Form"; // Existing tab name.
using (var document = SpreadsheetDocument.Open(fileName, isEditable: false))
{
var workbookPart = document.WorkbookPart;
var sheet = workbookPart.Workbook.Descendants<Sheet>().FirstOrDefault(s => s.Name == sheetName);
var worksheetPart = (WorksheetPart)(workbookPart.GetPartById(sheet.Id));
var sheetData = worksheetPart.Worksheet.Elements<SheetData>().First();
foreach (var row in sheetData.Elements<Row>())
{
foreach (var cell in row.Elements<Cell>())
{
Console.Write("|" + GetCellValue(cell, workbookPart));
}
Console.Write("\n");
}
}
}
/// <summary>
/// Got code from: https://msdn.microsoft.com/en-us/library/office/hh298534.aspx
/// </summary>
/// <param name="cell"></param>
/// <param name="workbookPart"></param>
/// <returns></returns>
private string GetCellValue(Cell cell, WorkbookPart workbookPart)
{
if (cell == null)
{
return null;
}
var value = cell.CellFormula != null
? cell.CellValue.InnerText
: cell.InnerText.Trim();
// If the cell represents an integer number, you are done.
// For dates, this code returns the serialized value that
// represents the date. The code handles strings and
// Booleans individually. For shared strings, the code
// looks up the corresponding value in the shared string
// table. For Booleans, the code converts the value into
// the words TRUE or FALSE.
if (cell.DataType == null)
{
return value;
}
switch (cell.DataType.Value)
{
case CellValues.SharedString:
// For shared strings, look up the value in the
// shared strings table.
var stringTable =
workbookPart.GetPartsOfType<SharedStringTablePart>()
.FirstOrDefault();
// If the shared string table is missing, something
// is wrong. Return the index that is in
// the cell. Otherwise, look up the correct text in
// the table.
if (stringTable != null)
{
value =
stringTable.SharedStringTable
.ElementAt(int.Parse(value)).InnerText;
}
break;
case CellValues.Boolean:
switch (value)
{
case "0":
value = "FALSE";
break;
default:
value = "TRUE";
break;
}
break;
}
return value;
}

Use OLEDB Connection to communicate with excel files. it gives better result
using System.Data.OleDb;
string physicalPath = "Your Excel file physical path";
OleDbCommand cmd = new OleDbCommand();
OleDbDataAdapter da = new OleDbDataAdapter();
DataSet ds = new DataSet();
String strNewPath = physicalPath;
String connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
String query = "SELECT * FROM [Sheet1$]"; // You can use any different queries to get the data from the excel sheet
OleDbConnection conn = new OleDbConnection(connString);
if (conn.State == ConnectionState.Closed) conn.Open();
try
{
cmd = new OleDbCommand(query, conn);
da = new OleDbDataAdapter(cmd);
da.Fill(ds);
}
catch
{
// Exception Msg
}
finally
{
da.Dispose();
conn.Close();
}
The Output data will be stored in dataset, using the dataset object you can easily access the datas.
Hope this may helpful

Using OlebDB, we can read excel file in C#, easily, here is the code while working with Web-Form, where FileUpload1 is file uploading tool
string path = Server.MapPath("~/Uploads/");
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
//get file path
filePath = path + Path.GetFileName(FileUpload1.FileName);
//get file extenstion
string extension = Path.GetExtension(FileUpload1.FileName);
//save file on "Uploads" folder of project
FileUpload1.SaveAs(filePath);
string conString = string.Empty;
//check file extension
switch (extension)
{
case ".xls": //Excel 97-03.
conString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Excel03ConString;Extended Properties='Excel 8.0;HDR=YES'";
break;
case ".xlsx": //Excel 07 and above.
conString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Excel07ConString;Extended Properties='Excel 8.0;HDR=YES'";
break;
}
//create datatable object
DataTable dt = new DataTable();
conString = string.Format(conString, filePath);
//Use OldDb to read excel
using (OleDbConnection connExcel = new OleDbConnection(conString))
{
using (OleDbCommand cmdExcel = new OleDbCommand())
{
using (OleDbDataAdapter odaExcel = new OleDbDataAdapter())
{
cmdExcel.Connection = connExcel;
//Get the name of First Sheet.
connExcel.Open();
DataTable dtExcelSchema;
dtExcelSchema = connExcel.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
string sheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
connExcel.Close();
//Read Data from First Sheet.
connExcel.Open();
cmdExcel.CommandText = "SELECT * From [" + sheetName + "]";
odaExcel.SelectCommand = cmdExcel;
odaExcel.Fill(dt);
connExcel.Close();
}
}
}
//bind datatable with GridView
GridView1.DataSource = dt;
GridView1.DataBind();
Source : https://qawithexperts.com/article/asp-net/read-excel-file-and-import-data-into-gridview-using-datatabl/209
Console application similar code example
https://qawithexperts.com/article/c-sharp/read-excel-file-in-c-console-application-example-using-oledb/168
If you need don't want to use OleDB, you can try https://github.com/ExcelDataReader/ExcelDataReader
which seems to have the ability to handle both formats (.xls and .xslx)

Excel File Reader & Writer Without Excel On u'r System
Download and add the dll for
NPOI u'r project.
Using this code to read a excel file.
using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
XSSFWorkbook XSSFWorkbook = new XSSFWorkbook(file);
}
ISheet objxlWorkSheet = XSSFWorkbook.GetSheetAt(0);
int intRowCount = 1;
int intColumnCount = 0;
for (; ; )
{
IRow Row = objxlWorkSheet.GetRow(intRowCount);
if (Row != null)
{
ICell Cell = Row.GetCell(0);
ICell objCell = objxlWorkSheet.GetRow(intRowCount).GetCell(intColumnCount); }}

You can use ExcelDataReader see GitHub
You need to install nugets :
-ExcelDataReader
-ExcelDataReader.DataSet
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.IO;
using ExcelDataReader;
using System.Text;
/// <summary>
/// Excel parsing in this class is performed by using a common shareware Lib found on:
/// https://github.com/ExcelDataReader/ExcelDataReader
/// </summary>
public static class ExcelParser
{
/// <summary>
/// Load, read and get values from Excel sheet
/// </summary>
public static List<FileRow> GetExcelRows(string path, string sheetName, bool skipFirstLine)
{
if (File.Exists(path))
{
return GetValues(path, sheetName, skipFirstLine);
}
else
throw new Exception("The process cannot access the file");
}
/// <summary>
/// Parse sheet names from given Excel file.
/// </summary>
public static List<string> GetSheetNames(string path)
{
using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
using (var excelReader = GetExcelDataReader(path, stream))
{
var dataset = excelReader.AsDataSet(new ExcelDataSetConfiguration()
{
ConfigureDataTable = (_) => new ExcelDataTableConfiguration()
{
UseHeaderRow = true
}
});
var names = from DataTable table in dataset.Tables
select table.TableName;
return names.ToList();
}
}
}
/// <summary>
/// Parse values from Excel sheet and add to Rows collection.
/// </summary>
public static List<FileRow> GetValues(string path, string sheetName, bool skipFirstLine)
{
var rowItems = new List<FileRow>();
using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (var excelReader = GetExcelDataReader(path, stream))
{
var dataset = excelReader.AsDataSet(new ExcelDataSetConfiguration()
{
ConfigureDataTable = (_) => new ExcelDataTableConfiguration()
{
UseHeaderRow = skipFirstLine
}
});
foreach (DataRow row in dataset.Tables[sheetName].Rows)
{
var rowItem = new FileRow();
foreach (var value in row.ItemArray)
rowItem.Values.Add(value);
rowItems.Add(rowItem);
}
}
}
return rowItems;
}
private static IExcelDataReader GetExcelDataReader(string path, Stream stream)
{
var extension = GetExtension(path);
switch (extension)
{
case "xls":
return ExcelReaderFactory.CreateBinaryReader(stream);
case "xlsx":
return ExcelReaderFactory.CreateOpenXmlReader(stream);
default:
throw new Exception(string.Format("'{0}' is not a valid Excel extension", extension));
}
}
private static string GetExtension(string path)
{
var extension = Path.GetExtension(path);
return extension == null ? null : extension.ToLower().Substring(1);
}
}
With this entity :
public class FileRow
{
public List<object> Values { get; set; }
public FileRow()
{
Values = new List<object>();
}
}
Use like that :
var txtPath = #"D:\Path\excelfile.xlsx";
var sheetNames = ExcelParser.GetSheetNames(txtPath);
var datas = ExcelParser.GetExcelRows(txtPath, sheetNames[0], true);

The recommended way to read Excel files on server side app is Open XML.
Sharing few links -
https://msdn.microsoft.com/en-us/library/office/hh298534.aspx
https://msdn.microsoft.com/en-us/library/office/ff478410.aspx
https://msdn.microsoft.com/en-us/library/office/cc823095.aspx

public void excelRead(string sheetName)
{
Excel.Application appExl = new Excel.Application();
Excel.Workbook workbook = null;
try
{
string methodName = "";
Excel.Worksheet NwSheet;
Excel.Range ShtRange;
//Opening Excel file(myData.xlsx)
appExl = new Excel.Application();
workbook = appExl.Workbooks.Open(sheetName, Missing.Value, ReadOnly: false);
NwSheet = (Excel.Worksheet)workbook.Sheets.get_Item(1);
ShtRange = NwSheet.UsedRange; //gives the used cells in sheet
int rCnt1 = 0;
int cCnt1 = 0;
for (rCnt1 = 1; rCnt1 <= ShtRange.Rows.Count; rCnt1++)
{
for (cCnt1 = 1; cCnt1 <= ShtRange.Columns.Count; cCnt1++)
{
if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1].Value2) == "Y")
{
methodName = NwSheet.Cells[rCnt1, cCnt1 - 2].Value2;
Type metdType = this.GetType();
MethodInfo mthInfo = metdType.GetMethod(methodName);
if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1 - 2].Value2) == "fn_AddNum" || Convert.ToString(NwSheet.Cells[rCnt1, cCnt1 - 2].Value2) == "fn_SubNum")
{
StaticVariable.intParam1 = Convert.ToInt32(NwSheet.Cells[rCnt1, cCnt1 + 3].Value2);
StaticVariable.intParam2 = Convert.ToInt32(NwSheet.Cells[rCnt1, cCnt1 + 4].Value2);
object[] mParam1 = new object[] { StaticVariable.intParam1, StaticVariable.intParam2 };
object result = mthInfo.Invoke(this, mParam1);
StaticVariable.intOutParam1 = Convert.ToInt32(result);
NwSheet.Cells[rCnt1, cCnt1 + 5].Value2 = Convert.ToString(StaticVariable.intOutParam1) != "" ? Convert.ToString(StaticVariable.intOutParam1) : String.Empty;
}
else
{
object[] mParam = new object[] { };
mthInfo.Invoke(this, mParam);
NwSheet.Cells[rCnt1, cCnt1 + 5].Value2 = StaticVariable.outParam1 != "" ? StaticVariable.outParam1 : String.Empty;
NwSheet.Cells[rCnt1, cCnt1 + 6].Value2 = StaticVariable.outParam2 != "" ? StaticVariable.outParam2 : String.Empty;
}
NwSheet.Cells[rCnt1, cCnt1 + 1].Value2 = StaticVariable.resultOut;
NwSheet.Cells[rCnt1, cCnt1 + 2].Value2 = StaticVariable.resultDescription;
}
else if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1].Value2) == "N")
{
MessageBox.Show("Result is No");
}
else if (Convert.ToString(NwSheet.Cells[rCnt1, cCnt1].Value2) == "EOF")
{
MessageBox.Show("End of File");
}
}
}
workbook.Save();
workbook.Close(true, Missing.Value, Missing.Value);
appExl.Quit();
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(ShtRange);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(NwSheet);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(workbook);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(appExl);
}
catch (Exception)
{
workbook.Close(true, Missing.Value, Missing.Value);
}
finally
{
GC.Collect();
GC.WaitForPendingFinalizers();
System.Runtime.InteropServices.Marshal.CleanupUnusedObjectsInCurrentContext();
}
}
//code for reading excel data in datatable
public void testExcel(string sheetName)
{
try
{
MessageBox.Show(sheetName);
foreach(Process p in Process.GetProcessesByName("EXCEL"))
{
p.Kill();
}
//string fileName = "E:\\inputSheet";
Excel.Application oXL;
Workbook oWB;
Worksheet oSheet;
Range oRng;
// creat a Application object
oXL = new Excel.Application();
// get WorkBook object
oWB = oXL.Workbooks.Open(sheetName);
// get WorkSheet object
oSheet = (Microsoft.Office.Interop.Excel.Worksheet)oWB.Sheets[1];
System.Data.DataTable dt = new System.Data.DataTable();
//DataSet ds = new DataSet();
//ds.Tables.Add(dt);
DataRow dr;
StringBuilder sb = new StringBuilder();
int jValue = oSheet.UsedRange.Cells.Columns.Count;
int iValue = oSheet.UsedRange.Cells.Rows.Count;
// get data columns
for (int j = 1; j <= jValue; j++)
{
oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[1, j];
string strValue = oRng.Text.ToString();
dt.Columns.Add(strValue, System.Type.GetType("System.String"));
}
//string colString = sb.ToString().Trim();
//string[] colArray = colString.Split(':');
// get data in cell
for (int i = 2; i <= iValue; i++)
{
dr = dt.NewRow();
for (int j = 1; j <= jValue; j++)
{
oRng = (Microsoft.Office.Interop.Excel.Range)oSheet.Cells[i, j];
string strValue = oRng.Text.ToString();
dr[j - 1] = strValue;
}
dt.Rows.Add(dr);
}
if(StaticVariable.dtExcel != null)
{
StaticVariable.dtExcel.Clear();
StaticVariable.dtExcel = dt.Copy();
}
else
StaticVariable.dtExcel = dt.Copy();
oWB.Close(true, Missing.Value, Missing.Value);
oXL.Quit();
MessageBox.Show(sheetName);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
}
}
//code for class initialize
public static void startTesting(TestContext context)
{
Playback.Initialize();
ReadExcel myClassObj = new ReadExcel();
string sheetName="";
StreamReader sr = new StreamReader(#"E:\SaveSheetName.txt");
sheetName = sr.ReadLine();
sr.Close();
myClassObj.excelRead(sheetName);
myClassObj.testExcel(sheetName);
}
//code for test initalize
public void runValidatonTest()
{
DataTable dtFinal = StaticVariable.dtExcel.Copy();
for (int i = 0; i < dtFinal.Rows.Count; i++)
{
if (TestContext.TestName == dtFinal.Rows[i][2].ToString() && dtFinal.Rows[i][3].ToString() == "Y" && dtFinal.Rows[i][4].ToString() == "TRUE")
{
MessageBox.Show(TestContext.TestName);
MessageBox.Show(dtFinal.Rows[i][2].ToString());
StaticVariable.runValidateResult = "true";
break;
}
}
//StaticVariable.dtExcel = dtFinal.Copy();
}

I'd recommend you to use Bytescout Spreadsheet.
https://bytescout.com/products/developer/spreadsheetsdk/bytescoutspreadsheetsdk.html
I tried it with Monodevelop in Unity3D and it is pretty straight forward. Check this sample code to see how the library works:
https://bytescout.com/products/developer/spreadsheetsdk/read-write-excel.html