if (DropDownList2.SelectedValue == "导出为word格式")

            {                 Response.Clear();                 Response.BufferOutput = true; 　　　　                 //设定输出的字符集 　　　　                 Response.Charset="GB2312"; 　　　　                 //假定导出的文件名为FileName.doc 　　　　                 Response.AppendHeader("ContentDisposition","p_w_upload;filename=FileName.doc"); 　　　　                 Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312"); 　　　　                 设置导出文件的格式 　　　　                 Response.ContentType="application/ms-word";

                StringWriter sw = new StringWriter();

                HtmlTextWriter htw = new HtmlTextWriter(sw);

                gvPersonList.RenderControl(htw);

                Response.Write(sw.ToString());

                Response.End();

            }             if (DropDownList2.SelectedValue == "导出为excel格式")             {               Response.ClearContent();               Response.Charset = "GB2312";               Response.ContentEncoding = System.Text.Encoding.UTF8;               Response.AddHeader("content-disposition", "p_w_upload; filename=excel.xlsx");               Response.ContentType = "application/ms-excel";               StringWriter sw = new StringWriter();               HtmlTextWriter htw = new HtmlTextWriter(sw);               gvPersonList.RenderControl(htw);              Response.Write(sw.ToString());              Response.End();             }