Remove Image in excel header after exporting the gidview - asp.net

Question

Kindly help me on how to remove image in my excel header. I generate the excel using export command using gridview as source data
here is my code
Response.AddHeader("content-disposition", "attachment;filename=" & strFilename & ".xls")
Response.Clear()
Response.Charset = ""
Response.ContentType = "application/vnd.xls"
Dim sw As System.IO.StringWriter = New System.IO.StringWriter()
Dim htw As System.Web.UI.HtmlTextWriter = New System.Web.UI.HtmlTextWriter(sw)
grvData.AllowPaging = False
grvData.AllowSorting = False
PopulateGrid()
grvData.RenderControl(htw)
Response.Write(sw.ToString)
Response.End()
Everything was set -except that one my header had a blank header name because of the image that was now shown - the image is came from gridview (I'm using arrow for asc and desc) - sorry i cant post any image here now

Answer 1

Give this ClearControls method a shot. It should remove any controls from the Grid before exporting:
protected void btnExport_Click(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-excel";
Response.Charset = "";
System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
this.ClearControls(DataGrid1);
DataGrid1.RenderControl(oHtmlTextWriter);
DataGrid1.GridLines = GridLines.Both;
DataGrid1.Style.Clear();
Response.Write(oStringWriter.ToString());
Response.End();
}
private void ClearControls(Control control)
{
for (int i = control.Controls.Count - 1; i >= 0; i--)
{
ClearControls(control.Controls[i]);
}
if (!(control is TableCell))
{
if (control.GetType().GetProperty("SelectedItem") != null)
{
LiteralControl literal = new LiteralControl();
control.Parent.Controls.Add(literal);
try
{
literal.Text = (string)control.GetType().GetProperty("SelectedItem").GetValue(control, null);
}
catch
{
//do nothing
}
finally
{
control.Parent.Controls.Remove(control);
}
}
else
{
if (control.GetType().GetProperty("Text") != null)
{
LiteralControl literal = new LiteralControl();
control.Parent.Controls.Add(literal);
literal.Text = (string)control.GetType().GetProperty("Text").GetValue(control, null);
control.Parent.Controls.Remove(control);
}
}
}
return;
}