خروجی گرفتن از جداول بانک با فرمت xls برای اکسل

Response.AddHeader("content-disposition", "attachment;filename=GridView-CV-Export.xls");

Response.Charset = "UTF-8";

Response.ContentType = "application/x-msdownload";
Response.HeaderEncoding = System.Text.UTF8Encoding.UTF8;
System.IO.StringWriter sw = new System.IO.StringWriter();

HtmlTextWriter htw = new HtmlTextWriter(sw);

GridViewexcel.RenderControl(htw);
Response.Write("<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />");
Response.Write(sw.ToString());

Response.End();