C# 向共享文件夾上傳及下載文件

//第一步創建共享連接

public static bool connectState(string path, string userName, string passWord)
        {
            bool Flag = false;
            Process proc = new Process();
            try
            {
                proc.StartInfo.FileName = "cmd.exe";
                proc.StartInfo.UseShellExecute = false;
                proc.StartInfo.RedirectStandardInput = true;
                proc.StartInfo.RedirectStandardOutput = true;
                proc.StartInfo.RedirectStandardError = true;
                proc.StartInfo.CreateNoWindow = true;
                proc.Start();
                string dosLine = @"net use " + path + " /User:" + userName + " " + passWord + " /PERSISTENT:YES";
                proc.StandardInput.WriteLine(dosLine);
                proc.StandardInput.WriteLine("exit");
                while (!proc.HasExited)
                {
                    proc.WaitForExit(1000);
                }
                string errormsg = proc.StandardError.ReadToEnd();
                proc.StandardError.Close();
                if (string.IsNullOrEmpty(errormsg))
                {
                    Flag = true;
                }
                else
                {
                    throw new Exception(errormsg);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                proc.Close();
                proc.Dispose();
            }
            return Flag;
        }

//第二部上傳文件

public void UpLoadFile(string fileNamePath, string urlPath, string User, string Pwd)
        {
            string newFileName = fileNamePath.Substring(fileNamePath.LastIndexOf(@"\") + 1);//取文件名稱
            MessageBox.Show(newFileName);
            if (urlPath.EndsWith(@"\") == false) urlPath = urlPath + @"\";

            urlPath = urlPath + newFileName;

            WebClient myWebClient = new WebClient();
            
            NetworkCredential cread = new NetworkCredential();
            
            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("文件上傳成功！", "提醒", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    MessageBox.Show("文件上傳錯誤！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }

                postStream.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "錯誤");
            }

        }

//下載文件

public void DownLoadFile(string URL, string DIR)
        {
            string FileName = URL.Substring(URL.LastIndexOf("\\") + 1);
            string PATH = DIR + FileName;
            try
            {
                WebRequest SC = WebRequest.Create(URL);
            }
            catch
            {
            }
            try
            {
                //client.DownloadFile(URL, PATH);
            }
            catch
            {
            }
        }

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