需要实现用FTP把文件上传到FTP的服务器上，试了以下的方式都不行，请问在C#该如何写呢?  代码如下:

private void MainForm_Load(object sender, System.EventArgs e)
        {
            
            System.Diagnostics.Process proc = new System.Diagnostics.Process();
            proc.EnableRaisingEvents=false;
            proc.StartInfo.UseShellExecute = true;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.StartInfo.FileName="ftp.exe";
            proc.StartInfo.Arguments="open ftpserver";
            proc.StartInfo.Arguments="username";
            proc.StartInfo.Arguments="password";
            proc.StartInfo.Arguments="prompt off";
            proc.StartInfo.Arguments="cd folder-in-ftp-server";
            proc.StartInfo.Arguments="lcd folder-in-local";
            proc.StartInfo.Arguments="mput *.jpg";
            proc.StartInfo.Arguments="bye";
            proc.StartInfo.CreateNoWindow = true;
            proc.Start();
            proc.WaitForExit();
            Close();
}

private void Upload(string filename)
{
FileInfo fileInf = new FileInfo(filename);
string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
FtpWebRequest reqFTP;
// 根据uri创建FtpWebRequest对象
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));
// ftp用户名和密码
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
// 默认为true，连接不会被关闭
// 在一个命令之后被执行
reqFTP.KeepAlive = false;
// 指定执行什么命令
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;
// 指定数据传输类型
reqFTP.UseBinary = true;
// 上传文件时通知服务器文件的大小
reqFTP.ContentLength = fileInf.Length;
// 缓冲大小设置为2kb
int buffLength = 2048;
byte[] buff = new byte[buffLength];
int contentLen;
// 打开一个文件流 () 去读上传的文件
FileStream fs = fileInf.OpenRead();
try
{
// 把上传的文件写入流
Stream strm = reqFTP.GetRequestStream();
// 每次读文件流的2kb
contentLen = fs.Read(buff, 0, buffLength);
// 流内容没有结束
while (contentLen != 0)
{
// 把内容从file stream 写入 upload stream
strm.Write(buff, 0, contentLen);
contentLen = fs.Read(buff, 0, buffLength);
}
// 关闭两个流
strm.Close();
fs.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Upload Error");
}
}