gridview excel export

Response.Clear(); Response.AddHeader("content-disposition","attachment;filename=Test.xls"); Response.ContentType = "application/ms-excel"; Response.ContentEncoding = System.Text.Encoding.Unicode; Response.BinaryWrite(System.Text.Encoding.Unicode.GetPreamble()); System.IO.StringWriter sw = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter hw = new HtmlTextWriter(sw); FormView1.RenderControl(hw); Response.Write(sw.ToString()); Response.End();