IE下载时提示无法下载，重试后成功

  // Add Excel as content type and attachment
  Response.ContentType = “application/vnd.ms-excel”;
  Response.AddHeader(“Content-Disposition”, “attachment; filename=” + binTarget);

  mStream.Position = 0;
  mStream.WriteTo(Response.OutputStream);
  Response.Flush();

  // BAD PATTERN: DO NOT USE. 
  // See http://blogs.msdn.com/b/aspnetue/archive/2010/05/25/response-end-response-close-and-how-customer-feedback-helps-us-improve-msdn-documentation.aspx
  Response.Close();           

IE10以上会严格校验Content-Length和Transfer-Encoding，如果武断使用 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();该为Response.End();问题迎刃而解！！！