public void Load()
{
    Image img = Image.FromStream(Info("ftp://211.145.1.137/feibiht/upLoad/img/", "noimg.gif"));
}

/// <summary>
/// 
/// </summary>
/// <param name="ftpUrl">FTP地址</param>
/// <param name="fileName">文件名</param>
/// <returns></returns>
public Stream Info(string ftpUrl,string fileName)
{
      try
      {
           FtpWebRequest reqFtp = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpUrl + "" + fileName)); 
           reqFtp.UseBinary = true;
           FtpWebResponse respFtp = (FtpWebResponse)reqFtp.GetResponse();
           Stream stream = respFtp.GetResponseStream();
           return stream;
      }
      catch (Exception)
      {
           throw;
      }
}