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ASP.Net: Export from Gridview to Excel in C#

In another example I had written about how to export from list of records to excel file. But one of my friends asked me to write a sample to export from Gridview to excel file.

Here is that function which will export from Gridview to excel file:
/// <summary>
/// Export Gridview to excel.
/// </summary>
private void ExportGridviewToExcel()
{
    Response.Clear();
    Response.AddHeader("content-disposition", 
                        "attachment;filename= Test_Data.xls");
    Response.Charset = "";
    Response.ContentType = "application/vnd.xls";

    var stringWriter = new System.IO.StringWriter();
    var htmlWriter = new HtmlTextWriter(stringWriter);

    // Added gridview to HtmlForm to handle the exception:
    // Control 'TestGrid' of type 'GridView' must be placed
    // inside a form tag with runat=server.
    var form = new System.Web.UI.HtmlControls.HtmlForm();
    Controls.Add(form);
    form.Controls.Add(TestGrid); // TestGrid is name of GridView.

    // Render Form Control
    form.RenderControl(htmlWriter);

    Response.Write(stringWriter.ToString());
    Response.End();
}
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