C# 通过Response.TransmitFile导出的Xml中缺少结束标记

我正在使用以下C asp.net代码导出XML文件

var myfile = new FileInfo(filePath);
            if (myfile.Exists)
            {
                HttpContext.Current.Response.ClearContent();
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + myfile.Name);
                HttpContext.Current.Response.AddHeader("Content-Length", myfile.Length.ToString());
                HttpContext.Current.Response.ContentType = "text/xml";
                HttpContext.Current.Response.TransmitFile(myfile.FullName);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.Close();
                HttpContext.Current.Response.End();
            }

导出已成功完成，但当我查看导出的xml文件时，xml文件的结束标记已损坏。这意味着有些词是含混不清的

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有人能告诉我这是什么原因吗

它适用于此代码：

 var myfile = new FileInfo(filePath);
            if (myfile.Exists)
            {
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + myfile.Name);
                HttpContext.Current.Response.AddHeader("Content-Length", myfile.Length.ToString());
                HttpContext.Current.Response.ContentType = "text/xml";
                HttpContext.Current.Response.TransmitFile(myfile.FullName);
                HttpContext.Current.Response.End();                
            }