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HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment;  filename={0}.xlsx", HttpUtility.UrlEncode(strFileName, Encoding.UTF8)));
                HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;

                HttpContext.Current.Response.Buffer = true;
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.BinaryWrite(pck.GetAsByteArray());

                //HttpContext.Current.ApplicationInstance.CompleteRequest();
                HttpContext.Current.Response.End();

Click Export abnormal way not to call, click to change the trigger event (EnableAjax = "false") || href = "method."