Exporta Panel with controls to Excel

See more:

C#

ASP.NET

Hello, please help me to export a panel with controls to Excel or PDF; when i try ot export with my code just appear an error.

try
{
pnl.EnableViewState = false;
string attachment = "attachment; filename=" + fileName + ".xls"; //Setting the attachment name.
HttpContext.Current.Response.ClearContent(); //clears all content output from the buffer stream.
HttpContext.Current.Response.AddHeader("content-disposition", attachment);
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
using (HtmlForm frm = new HtmlForm())
{
Page.EnableViewState = false;
frm.Attributes["runat"] = "server";

pnl.Parent.Controls.Add(frm);
frm.Controls.Add(pnl);
frm.RenderControl(htw);
HttpContext.Current.Response.Write(sw.ToString());
HttpContext.Current.Response.End();
}

}
}
}
catch (Exception ex)
{
throw ex;
}

}


Regards