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how to read comments of excel sheet in c#

i am trying to read the comments from excel sheet but unable to do so. Please help. Thanks in advance. my code is as follows-
Excel.Application appExl;
Excel.Workbook workbook;
Excel.Worksheet NwSheet;
Excel.Range ShtRange;
appExl = new Excel.Application();
workbook = appExl.Workbooks.Open(Server.MapPath("~/" + System.Configuration.ConfigurationManager.AppSettings["ExcelFile"] + fileName), Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
NwSheet = (Excel.Worksheet)workbook.Sheets.get_Item(1);
string obj = NwSheet.Range[0].Comment.Text;

You basically had it, but as Wimbo said, 0 isn't a valid range.
When interoping with Office from .Net, arrays always start at one. A range is a 2D array, so once you have a range, the top left cell in that Range is accessed like so:
using Excel = Microsoft.office.Interop.Excel;
Excel.Range range = worksheet.Cells[1,1];
To access the cell below the top left one, you would do this:
Excel.Range range = worksheet.Cells[2,1]; //It goes row, then column
To access the cell one to the right of the top left cell, you do this:
Excel.Range range = worksheet.Cells[1,2];
If you are working in .Net 4 or above, you don't need to specify the optional parameters (in otherwords you can drop all of the Missing.Value's). I'm guessing you want to get the comment in Cell A1 on Sheet 1 in a workbook, I would do this like so:
using System.Runtime.InteropServices;
using Excel = Microsoft.Office.Interop.Excel;
namespace ExcelComments
{
class Program
{
static void Main()
{
var application = new Excel.Application();
var workbook = application.Workbooks.Open(#"C:\Yada yada\workbook with comments.xlsx");
Excel.Worksheet worksheet = workbook.Sheets[1];
Excel.Range range = worksheet.Cells[1, 1];
//Here is your comment as a string
var myComment = range.Comment.Text();
workbook.Close(false);
application.Quit();
Marshal.ReleaseComObject(application);
}
}
}

how to send paramter from c# to excel and save the data there

i have 2 issues what i am facing
i have an dataset where i need to send the data from dataset to an
excel once data in dumped in that location.
i need to change the column headers make them bold
2:
Above the report headers we should pass 1 parameter that will be the name(Employee details) from c# we need to pass as an parameter to it.
it can change what ever parameter we pass it on.
ex:
Reportname: Employee details
Name EmpID city
Arun 11 bangalore
Kiran 56 chennai
Rahul 23 pune

The following should work, but I did not test it. Thank you to Deborah Kurata for writing a large part of the code below.
using Excel = Microsoft.Office.Interop.Excel;
using System.Reflection;
private void ExportToExcel(DataTable Table, string ReportName, string Filename)
{
Excel.Application oXL;
Excel.Workbook oWB;
Excel.Worksheet oSheet;
Excel.Range oRange;
// Start Excel and get Application object.
oXL = new Excel.Application();
// Set some properties
oXL.Visible = true;
oXL.DisplayAlerts = false;
// Get a new workbook.
oWB = oXL.Workbooks.Add(Missing.Value);
// Get the active sheet
oSheet = (Excel.Worksheet)oWB.ActiveSheet ;
oSheet.Name = "Report";
int rowCount = 3;
foreach (DataRow dr in Table.Rows)
{
for (int i = 1; i < Table.Columns.Count+1; i++)
{
// Add the header the first time through
if (rowCount==3)
{
oSheet.Cells[1, i] = Table.Columns[i - 1].ColumnName;
rowCount++;
}
oSheet.Cells[rowCount, i] = dr[i - 1].ToString();
}
rowCount++;
}
// Resize the columns
oRange = oSheet.get_Range(oSheet.Cells[3, 1],
oSheet.Cells[rowCount, Table.Columns.Count]);
oRange.EntireColumn.AutoFit();
// Set report title *after* we adjust column widths
oSheet.Cells[1,1] = ReportName;
// Save the sheet and close
oSheet = null;
oRange = null;
oWB.SaveAs(Filename, Excel.XlFileFormat.xlWorkbookNormal,
Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Excel.XlSaveAsAccessMode.xlExclusive,
Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value);
oWB.Close(Missing.Value, Missing.Value, Missing.Value);
oWB = null;
oXL.Quit();
// Clean up
// NOTE: When in release mode, this does the trick
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
}

Save an excel file in c#

void excelsave()
{
try
{
ApplicationClass app = new ApplicationClass(); // the Excel application.
Workbook book = null;
Worksheet sheet = null;
Range range = null;
// the range object is used to hold the data
app.Visible = false;
app.ScreenUpdating = false;
app.DisplayAlerts = false;
string execPath =
Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
book = app.Workbooks.Open(#"E:\SSIS\ABC\Book1.xls",
Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, Missing.Value);
sheet = (Worksheet)book.Worksheets[1];
range = sheet.get_Range("A1", Missing.Value);
range.Columns.ColumnWidth = 22.34;
range = sheet.get_Range("B1", Missing.Value);
range.Columns.ColumnWidth = 22.34;
book.SaveAs(#"E:\SSIS\ABC\Book1.xls", Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlExclusive,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
}
catch (Exception ex)
{
}
}
Here I am opening an excel sheet trying to increase the column width and need to make the column headers as bold and save the document, right now the document is not getting saved. I am using vs 2008, c# 3.5
Is There anything that I am doing wrong here? any help on this would be great
looking an for solution

I ran the following using VS 2010 and .NET 4, but this code should still work in your environment. Also, I simplified your code a bit. Hopefully this will get you going in the right direction.
static void excelsave()
{
try
{
Application app = new Application();
string execPath =
Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
Workbook book = app.Workbooks.Open(#"c:\test.xls");
Worksheet sheet = (Worksheet)book.Worksheets[1];
Range range = sheet.get_Range("A1");
range.Columns.ColumnWidth = 22.34;
range = sheet.get_Range("B1");
range.Columns.ColumnWidth = 22.34;
sheet.get_Range("A1", "B1").Font.Bold = true;
book.SaveAs(#"c:\test2.xls"); // or book.Save();
book.Close();
}
catch (Exception ex)
{
}
}
UPDATE
You can find a similar explanation/example of what you are doing at:
http://www.dotnetperls.com/excel
Marshal.ReleaseComObject(book); // do this after the close
Also, there is a good discussion on cleaning up Excel/COM ...
How To Properly Clean Up Excel Interop Objects In c#

com exception HRESULT: 0x800A03EC

I write a c# program for copy sheet. I got the exception error(0x800A03EC) when I call WorkSheet.Copy method until 105 times.
This is my snippet code: using Microsoft.Office.Interop.Excel;
private void CreateSheet(string dst_fileName)
{
object cell1 = "A2";
ApplicationClass app = null;
Workbook book = null;
Worksheet sheet = null;
Worksheet sheet_to_copy = null;
int i=0;
try
{
app = new ApplicationClass();
app.Visible = false;
app.ScreenUpdating = false;
app.DisplayAlerts = false;
book = app.Workbooks.Open(dst_fileName, 0, false, 5, "", "", true,
XlPlatform.xlWindows,
"\t", false, false, 0, true, 1, 0);
// Reference to the worksheet
sheet_to_copy = (Worksheet)book.Worksheets[1];
for(;i<listViewPrg.Items.Count;i++)
{
sheet = (Worksheet)book.Worksheets[book.Worksheets.Count];
// Copy the worksheet to the end of the worksheets
sheet_to_copy.Copy(Missing.Value, sheet);
sheet.Name = "NewSheet(" + book.Worksheets.Count + ")";
}
book.SaveAs(dst_fileName, Missing.Value, Missing.Value, Missing.Value,
Missing.Value, Missing.Value, XlSaveAsAccessMode.xlNoChange, Missing.Value,
Missing.Value, Missing.Value, Missing.Value, Missing.Value);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
finally
{
QuitExcel(app);
}
}
I can't found any solution about this. Could someone give me a hint to solve this problem?
Thank you so much.

Possibly you have some corrupted Excel registry entries or so?
Why don't you try to use an open source reader of excel files and do everything using them? The speed would skyrocket and i guarantee you would not get these errors!

Searching a collection of excel sheets w/C#

I'm trying to get C# to examine whatever workbook the user has selected and find any sheets which would
contain stock data. Concretely this would mean looking at a range of cells (say r<6, c<10) for "Close", "close" or
"CLOSE".
The following code shows the point at which the user has selected an .xls file.
I'm not sure how to loop through the sheets in the workbook to look for the desired text.
I'm assuming it involves creating a collection of sheets and assigning it to those in the
current workbook, but my attempts so far haven't worked.
private void button1_Click(object sender, System.EventArgs e)
{
try
{
OpenFileDialog dlg = new OpenFileDialog();
dlg.Filter = "Excel Files (*.xls)|*.XLS";
if (dlg.ShowDialog() == DialogResult.OK)
{
// MessageBox.Show(dlg.FileName, "My Application", MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk);
Excel.Application xlApp = new Excel.ApplicationClass();
xlApp.Visible = true;
Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(dlg.FileName,
0, false, 5, "", "", false, Excel.XlPlatform.xlWindows, "",
true, false, 0, true, false, false);
}
}
catch (Exception theException)
{
String errorMessage;
errorMessage = "Error: ";
errorMessage = String.Concat(errorMessage, theException.Message);
errorMessage = String.Concat(errorMessage, " Line: ");
errorMessage = String.Concat(errorMessage, theException.Source);
MessageBox.Show(errorMessage, "Error");
}
}
Thanks for any ideas.
Jeff

Always take extra care to clean up when using the Interop libraries. Otherwise, you're likely to end up with a couple dozen EXCEL.EXE processes running in the background while you debug (or when a user hits an error).
private static bool IsStockDataWorkbook(string fileName)
{
Excel.Application application = null;
Excel.Workbook workbook = null;
try
{
application = new Excel.ApplicationClass();
application.Visible = true;
workbook = application.Workbooks.Open(fileName, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
foreach (Excel.Worksheet sheet in workbook.Worksheets)
{
if (IsStockWorksheet(sheet))
{
return true;
}
}
return false;
}
finally
{
if (workbook != null)
{
workbook.Close(false, Missing.Value, Missing.Value);
}
if (application != null)
{
application.Quit();
}
}
}
private static bool IsStockWorksheet(Excel.Worksheet workSheet)
{
Excel.Range testRange = workSheet.get_Range("C10", Missing.Value);
string value = testRange.get_Value(Missing.Value).ToString();
return value.Equals("close", StringComparison.InvariantCultureIgnoreCase);
}

You'll need to assign objSheets to something, most likely:
Excel.Sheets objSheets = xlWorkbook.Sheets;
Your foreach statement should look more like this (with no prior declaration of the ws variable):
foreach(Excel.Worksheet ws in objSheets)
{
rng = ws.get_Range(ws.Cells[1,1], ws.Cells[5,9]);
}
Obviously, you'll want to do something more substantial in that loop.

This is an easy one :) use the sheets collection in the workbook object.

Workbooks workbooks = xlApp.Workbooks;
foreach(Workbook wb in workbooks)
{
Worksheets worksheets = wb.Worksheets;
foreach(Worksheet ws in worksheets)
{
Range range = ws.get_Range(ws.Cells[1,1], ws.Cells[5,9]);
Range match = range.Find("close", ws.Cells[1,1],
xlFindLookIn.xlValues, xlLookAt.xlPart,
xlSearchOrder.xlByColumns, xlSearchDirection.xlNext,
false, false, false); //that first false means ignore case
// do something with your match here
// this will only return the first match; to return all
// you'll need to run the match in a while loop
}
}