protected void Page_Load(object sender, EventArgs e) { string file_name = Request.QueryString["file_name"] == null ? "0" : Request.QueryString["file_name"]; if (String.Equals(file_name, "0")) { Response.Redirect("/login.aspx"); } else { DataTable dt = null; dt = Session["DataTableRangosStock"] as DataTable; GridViewExportUtil.ExportDataTableToExcel(dt, file_name); Session["DataTableRangosStock"] = null; } }