Export GridView to Excel in web part

Question

Hello
I was trying to export grid view to excel,  in pure asp.net it works fine. But in Sharepoint web part after I click Export to Excel link button, other controls stop working and work only after manual page refresh. How to make it work in sharepoint?

//export to excel click handler

protected void BtnExportGrid_Click(object sender, EventArgs args)

{

HttpContext.Current.Response.Clear();

HttpContext.Current.Response.AddHeader(

"content-disposition", string.Format("attachment; filename={0}", "Customers.xls"));

HttpContext.Current.Response.ContentType = "application/ms-excel";

using (StringWriter sw = new StringWriter())

{

using (HtmlTextWriter htw = new HtmlTextWriter(sw))

{

//  Create a table to contain the grid

Table table = new Table();

//  add each of the data rows to the table

foreach (GridViewRow row in gv.Rows)

{

GridViewExportUtil.PrepareControlForExport(row);

table.Rows.Add(row);

}

//  render the table into the htmlwriter

table.RenderControl(htw);

//  render the htmlwriter into the response

HttpContext.Current.Response.Write(sw.ToString());

HttpContext.Current.Response.End();

}

}

}