Winform 中上传文件到服务器

    目前有一个需求，需要通过 Winform界面上传文件到服务器，写了如下的方法，方法调用:
   UploadFile(@"\\10.2.11.23\d$","1.txt") ; 但是用这种方法上传不了，提示路径拒绝访问，请问大家指教（我知道设置IIS和FTP是可行的，但是不想使用这种方法，希望在不改变服务器配置的情况下，实现和传功能）   private void UpLoadFile(string fileNamePath, string urlPath)
        {
            string newFileName = fileNamePath.Substring(fileNamePath.LastIndexOf(@"\") + 1);            if (urlPath.EndsWith(@"\") == false) urlPath = urlPath + @"\";            urlPath = urlPath + newFileName;            WebClient myWebClient = new WebClient();
            NetworkCredential cread = new NetworkCredential("Administrator", "XXXXX", "Domain");
            myWebClient.Credentials =      cread;
            FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
            BinaryReader r = new BinaryReader(fs);
            
            try
            {
                byte[] postArray = r.ReadBytes((int)fs.Length);
                Stream postStream = myWebClient.OpenWrite(urlPath   );
               // postStream.m
                if (postStream.CanWrite)
                {
                    postStream.Write(postArray, 0, postArray.Length);
                    MessageBox.Show("UploadFile is OK...");
                }
                else
                {
                    MessageBox.Show("file cannot write!");
                }                postStream.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error" );
            } 
        }