Develop Reference

add a row in an existing Excel file and save it

I'm having problems saving new rows in my existing Excel file, it throws an exception and says "write-protected". My Excel file is not open or something I created it with this code and saved it.
...
xlWorkBook.SaveAs(path, Excel.XlFileFormat.xlWorkbookDefault, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
Marshal.ReleaseComObject(xlWorkSheet);
Marshal.ReleaseComObject(xlWorkBook);
Marshal.ReleaseComObject(xlApp);
#endregion
endState = 7;
wasSuccessful = true;
Maybe I cant save it because it's open while I opened it to change it. So delete and save again maybe? or just save like you would save it after adding a row more in a normal Excel file and close it.
if (System.IO.File.Exists(path))
{
Excel.Application xlApp = new Excel.Application();
object misValue = System.Reflection.Missing.Value;
//open existing Excel file
var wb = xlApp.Workbooks.Open(path, FileMode.Open, FileAccess.Read);
//get Sheet
Excel.Worksheet ws = (Excel.Worksheet)wb.Worksheets[1];
//get the last Row who is filled
Excel.Range xlRange = (Excel.Range)ws.get_Range("A" + ws.Rows.Count, Type.Missing);
int LastRow = xlRange.get_End(Microsoft.Office.Interop.Excel.XlDirection.xlUp).Row;
//def. next free row
int newRow = LastRow + 1;
//fill Cells
ws.Cells[newRow, 1] = LastRow - 3;
ws.Cells[newRow, 2] = BLZ;
ws.Cells[newRow, 3] = DK;
ws.Cells[newRow, 4] = KPA;
ws.Cells[newRow, 5] = Produktschlüssel;
ws.Cells[newRow, 6] = KMAUSTextressource;
ws.Cells[newRow, 7] = Versandschlüssel;
ws.Cells[newRow, 8] = Kartennummer;
ws.Cells[newRow, 9] = Verarbeitungshinweis;
ws.Cells[newRow, 10] = Anrede;
ws.Cells[newRow, 11] = Kundenname1;
ws.Cells[newRow, 12] = Kundenname2;
ws.Cells[newRow, 13] = AnschriftZusatz;
ws.Cells[newRow, 14] = Straße;
ws.Cells[newRow, 15] = PLZuWohnort;
ws.Cells[newRow, 16] = alternativAusland;
ws.Cells[newRow, 26] = BLZ;
ws.Cells[newRow, 27] = DK;
xlApp.DisplayAlerts = false;
wb.SaveAs(path, Excel.XlFileFormat.xlOpenXMLWorkbook, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
wb.Close(true, path);
//wb.Close(true, misValue, misValue);
xlApp.Quit();
}

FileAccess.Read?
//open existing Excel file
var wb = xlApp.Workbooks.Open(path, FileMode.Open, FileAccess.Read);
I've things work with just:
Excel.Workbook workbook = excel.Workbooks.Open(#"C:\MyExcelFile.xlsx"); // No other arguments
Complete version:
using Excel = Microsoft.Office.Interop.Excel;
void DoWorkWithExcel()
{
Excel.Application excel = null;
Excel.Workbook workbook = null;
Excel.Worksheet worksheet = null;
string excelFile = #"C:\MyExcelFile.xlsx";
try
{
excel = new Excel.Application { Visible = true, DisplayAlerts = false };
workbook = excel.Workbooks.Open(excelFile);
worksheet = (Excel.Worksheet)workbook.Worksheets[1];
int newRow = worksheet.Range["A" + worksheet.Rows.Count, Type.Missing]
.End[Excel.XlDirection.xlUp].Row + 1;
// Fill you cells
worksheet.Cells[newRow, 1] = newRow - 4; // Your LastRow + 1 - 3;
worksheet.Cells[newRow, 2] = BLZ;
worksheet.Cells[newRow, 3] = DK;
// And others...
// Save changes
workbook.Save();
}
catch (Exception ex) // Or System.Runtime.InteropServices.COMException
{
// Handle it or log or do nothing
}
finally
{
// Close Book and Excel and release COM Object
workbook?.Close(0);
excel?.Quit();
Marshal.ReleaseComObject(excel);
}
}

I want to create xlsx (Excel) file from c#

This is a code which could create only create xls file. But I want to create xlsx (Excel) file; how can I do that from this code or else can I have another code which I could use to create xlsx files.
using Excel = Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;
Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
MessageBox.Show("Excel is not properly installed!!");
return;
}
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet.Cells[1, 1] = "ID";
xlWorkSheet.Cells[1, 2] = "Name";
xlWorkSheet.Cells[2, 1] = "1";
xlWorkSheet.Cells[2, 2] = "One";
xlWorkSheet.Cells[3, 1] = "2";
xlWorkSheet.Cells[3, 2] = "Two";
xlWorkBook.SaveAs("d:\\vdfgdfg.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
Marshal.ReleaseComObject(xlWorkSheet);
Marshal.ReleaseComObject(xlWorkBook);
Marshal.ReleaseComObject(xlApp);
MessageBox.Show("Excel file created , you can find the file d:\\csharp-Excel.xls");
}

Please try below updated code.
public void CreateExcel()
{
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
MessageBox.Show("Excel is not properly installed!!");
return;
}
Microsoft.Office.Interop.Excel.Workbook xlWorkBook;
Microsoft.Office.Interop.Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
xlWorkBook = xlApp.Workbooks.Add(misValue);
xlWorkSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
xlWorkSheet.Cells[1, 1] = "ID";
xlWorkSheet.Cells[1, 2] = "Name";
xlWorkSheet.Cells[2, 1] = "1";
xlWorkSheet.Cells[2, 2] = "One";
xlWorkSheet.Cells[3, 1] = "2";
xlWorkSheet.Cells[3, 2] = "Two";
//Here saving the file in xlsx
xlWorkBook.SaveAs("d:\\vdfgdfg.xlsx", Microsoft.Office.Interop.Excel.XlFileFormat.xlOpenXMLWorkbook, misValue,
misValue, misValue, misValue, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
Marshal.ReleaseComObject(xlWorkSheet);
Marshal.ReleaseComObject(xlWorkBook);
Marshal.ReleaseComObject(xlApp);
MessageBox.Show("Excel file created , you can find the file d:\\csharp-Excel.xlsx");
}

Take a look on EasyXLS. It is a library that creates xlsx files.
ExcelDocument workbook = new ExcelDocument(1);
// Set the sheet name
workbook.easy_getSheetAt(0).setSheetName("Sheet1");
// Add data
ExcelTable xlsTable = ((ExcelWorksheet)workbook.easy_getSheetAt(0)).easy_getExcelTable();
xlsTable.easy_getCell(0, 0).setValue("ID");
xlsTable.easy_getCell(0, 1).setValue("Name");
xlsTable.easy_getCell(1, 0).setValue("1");
xlsTable.easy_getCell(1, 1).setValue("One");
xlsTable.easy_getCell(2, 0).setValue("2");
xlsTable.easy_getCell(2, 1).setValue("Two");
// Create Excel file
workbook.easy_WriteXLSXFile("d:\\vdfgdfg.xlsx");
See more at:
http://www.easyxls.com/manual/basics/create-excel-file.html

Try OpenXML library, should do the trick, find more at
Export DataTable to Excel with Open Xml SDK in c#
P.s. Interop won't work unless excel is installed on the machine.

Take a look at my SwiftExcel library. It was design for quick and easy excel output and what is more important - performance.
using (var ew = new ExcelWriter("C:\\temp\\test.xlsx"))
{
ew.Write("ID", 1, 1);
ew.Write("Name", 2, 1);
ew.Write("1", 1, 2);
ew.Write("One", 2, 2);
ew.Write("2", 1, 3);
ew.Write("Two", 2, 3);
}

Replace the following line:
xlWorkBook.SaveAs("d:\\vdfgdfg.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
with this line: xlWorkBook.SaveAs("d:\\vdfgdfg.xlsx");

Can't write to excel using C#?

I am writing a very simple program. It runs without any errors. But nothing is written into the Excel file. Am I wrong somewhere?
using Excel = Microsoft.Office.Interop.Excel;
// I already add this reference into my project
public Write()
{
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
xlApp = new Excel.Application();
xlWorkBook = xlApp.Workbooks.Open(Directory.GetCurrentDirectory() + "\\KKK.xlsx", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
// This is all I want to write to my Excel file
xlWorkSheet.Cells[1, 1] = "input";
xlWorkBook.SaveAs(Directory.GetCurrentDirectory() + "\\KQ" + ThoiGian(), Excel.XlFileFormat.xlWorkbookDefault, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
releaseObject(xlApp);
releaseObject(xlWorkBook);
releaseObject(xlWorkSheet);
}

Try
xlWorkSheet.Cells[1, 1].value = "input";

Range exception while saving data in Excel in Windows C#

Am trying to put in some data into excel cells. I get HResult rnge exception. below is the code. And also am not able to wrap the text in the cell [1,B] . am a fresher in using Office apps and not able to find a solution .
myExcelApp = new Excel.Application();
myExcelApp.Visible = true;
myExcelWorkbooks = myExcelApp.Workbooks;
String fileName1 = "D:\\book1.xlsx";
myExcelWorkbook = myExcelWorkbooks.Open(fileName1, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue);
Excel.Worksheet myExcelWorksheet = (Excel.Worksheet)myExcelWorkbook.ActiveSheet;
String cellFormulaAsString = myExcelWorksheet.get_Range("A2", misValue).Formula.ToString();
Microsoft.Office.Interop.Excel.Range range = myExcelWorksheet.UsedRange;
myExcelWorksheet.Cells[1, "A"] = text;
myExcelWorksheet.Cells[1, "B"] = commentText;
// myExcelWorksheet.Cells[1, "C"] = OccuranceList;
Excel.Range r = myExcelWorksheet.get_Range("B7", "A");
r.EntireRow.AutoFit();

Excel.Range r = myExcelWorksheet.get_Range("B7", "A");
You are missing a row number for Cell A
Something like this?
Excel.Range r = myExcelWorksheet.get_Range("B7", "A1");
FOLLOWUP
I just want to wrap text in cell[1,"B"] as the string is very large. – user1665707 59 mins ago
I dont get any error now. But the text wrapping is not happening. a part of the text is not visible. – user1665707 17 mins ago
Yes, it will not autofit. See this link for the reason.

Programmatically alter an excel rows or columns heigh

Probably easy one. How can i change rows or column heigh?
xlApp = new Excel.Application();
xlApp.Visible = true;
xlApp.DisplayAlerts = false;
Excel.Workbooks xlWorkBooks = xlApp.Workbooks;
xlWorkBook = xlWorkBooks.Open(directoryPath + "\\" + fileName, 0, false, 5, "", "", false, Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);
xlWorkSheets = xlWorkBook.Worksheets; //Get all the sheets in the workbook
xlWorkSheet = (Excel.Worksheet)xlWorkSheets.get_Item("Sheet1"); //Get the allready exists sheet
Excel.Range range = xlWorkSheet.UsedRange;
Excel.Range chartRange;
int colCount = range.Columns.Count;
int rowCount = range.Rows.Count;
xlWorkSheet.Cells[rowCount + 5, 1] = "Name and surname";
chartRange = xlWorkSheet.get_Range("a" + (rowCount + 5), "e" + (rowCount + 5));
chartRange.Font.Bold = true;
xlWorkBook.SaveAs(fileName, Excel.XlFileFormat.xlOpenXMLWorkbook, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(misValue, misValue, misValue);
xlWorkSheet = null;
xlWorkBook = null;
xlApp.Quit();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
Try it with xlWorkSheet.UsedRange.EntireRow.Height = value; but it doesn't work. autoFit() is working but i would like to work with my value.

I think you may be looking for RowHeight...
http://msdn.microsoft.com/en-us/library/microsoft.office.tools.excel.namedrange.rowheight(v=vs.80).aspx