public static void GridViewToExcel(GridView ctrl, string FileType, string         FileName)
        {
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.Charset = "GB2312";
            HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;//注意编码
            HttpContext.Current.Response.AppendHeader("Content-Disposition",
                "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
            HttpContext.Current.Response.ContentType = FileType;//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword 
            ctrl.AllowPaging = false;
            ctrl.DataBind();

            StringBuilder sbOutput = new StringBuilder("");
            for (int row = 0; row < ctrl.Rows.Count; row++)
            {
                for (int column = 1; column < ctrl.Rows[row].Cells.Count; column++)//从1开始是为了不加入选择的linkbutton
                {
                    sbOutput.Append(ctrl.Rows[row].Cells[column].Text.ToString() + "\t");
                }
                sbOutput.Append("\n");
            }

            HttpContext.Current.Response.Write(sbOutput.ToString());
            HttpContext.Current.Response.End();
        }

        protected void btn_GenerateExcel_Click(object sender, EventArgs e)
        {
            GridViewToExcel(gv_userScore, "application/ms-excel","分管用户成绩.xls");
        }