how to export data from selected columns in datagridview to excel in windows application using c# 2008?

I have been created windows application in Visual Studio 2008 using C# and MS Access for database.
I want to transfer selected column of datagidview to Excel with Header at runtime means client will select any column as per his choice and then export to excel.
 and date should be in dateformat ,it sholudnot include time.

Hi, convert this code to C# then try it.

Sub doExcel(Source as Object, E as EventArgs)
If gv.Rows.Count.ToString + 1 < 65536 Then
gv.AllowPaging="False"
gv.DataBind
Dim tw As New StringWriter()
Dim hw As New System.Web.UI.HtmlTextWriter(tw)
Dim frm As HtmlForm = new HtmlForm()
Response.ContentType = "application/vnd.ms-excel"
Response.AddHeader("content-disposition", "attachment;filename=" & "export.xls")
Response.Charset = ""
EnableViewState = False
Controls.Add(frm)
frm.Controls.Add(gv)
frm.RenderControl(hw)
Response.Write(tw.ToString())
Response.End()
gv.AllowPaging="True"
gv.Databind
Else
LblError.Text="Too many rows - Export to Excel not possible"
End If
End Sub

I have been refer those links and done some modification to get result.

now i am transferring selected column from datagridview and then export to excel but while doing this those unselected columns are also created with empty value in excel.
Now i want to know, how to delete null columns in excel using c#?

Post your complete code please.

Sid

DataGridView1.RowHeadersVisible = false;  
DataGridView1.SelectAll();
Clipboard.SetDataObject(DataGridView1.GetClipboardContent(), true);
StreamWriter sw = new StreamWriter("d:\\ReservationDetail.xls");
sw.Write(Clipboard.GetText());
sw.Flush();
sw.Close();
DataGridView1.ClearSelection();  
DataGridView1.RowHeadersVisible = true;

NeetD: I don't know C# as I code in vb.net but what I can see from your code is that this line

DataGridView1.SelectAll();

is selecting all the contents of the datagrid. I believe there is a click event of the grid where you can transfer the current column to Excel?

Sid