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 var gv = new GridView();  StringWriter objStringWriter = new StringWriter();   HtmlTextWriter objHtmlTextWriter;  gv.DataSource = Dt;  (Set DataTable or List Data)                     gv.DataBind();                     Response.ClearContent();                     Response.Buffer = true;                     Response.AddHeader("content-disposition", "attachment; filename=schoollist.xls");                     Response.ContentType = "application/ms-excel";      ...