IE下载时提示无法下载，重试后成功

DataGrid dg = new DataGrid();
            dg.DataSource = dtSource;
            dg.DataBind();

            Response.Clear();
            Response.Charset = "UTF-8";//GB2312
            Response.ContentType = "application/vnd.ms-excel";//text/csv
            Response.ContentEncoding = System.Text.Encoding.UTF8;
            Response.AppendHeader("Content-Disposition", "attachment;filename=JobStorage.xls");

            System.IO.StringWriter oSW = new System.IO.StringWriter();
            HtmlTextWriter oHW = new HtmlTextWriter(oSW);
            dg.RenderControl(oHW);
            Response.Write(oSW.ToString());
            Response.Flush();
            //Response.Close();
            Response.End();

IE10以上会严格校验Content-Length和Transfer-Encoding，盲目使用 Response.Close();会导致直接切断，浏览器到服务器端的套接字连接，会产生数据到丢失，而导致实际传输长度和指定不一致，clicks Retry后IE将不在严格校验，所以重试之后正常下载，低端到IE版本没有严格校验到问题如：IE8。所以将Response.Close();更改为Response.End();问题解决。