******如何使用FtpWebRequest对ftp服务器上面的目录进行改名（注意是目录不是文件！）*****

比如我的ftp服务器针对user用户建立了一个目录（名字为0）
那么我在客户端如何对其改名(改为1）了？
请大家帮忙提供下正确的代码（最好自己先测试通过！）
下面是我的部分代码
URI = @"ftp://"+服务器ip+"/0";
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to delete
ftp.Method = System.Net.WebRequestMethods.Ftp.Rename;
ftp.RenameTo = "/1";
try
{
//get response but ignore it
string str = GetStringResponse(ftp);///运行到这里会报错！！！
}
catch (Exception)
{
return false;
}

//Get the basic FtpWebRequest object with the
//common settings and security
private FtpWebRequest GetRequest(string URI)
{
URI = @"ftp://" + URI;

FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);

result.Credentials = GetCredentials();

result.EnableSsl = false;

result.KeepAlive = false;
// support for passive connections
result.UsePassive = true;
return result;
}

private string GetStringResponse(FtpWebRequest ftp)
{
//Get the result, streaming to a string
string result = "";
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
long size = response.ContentLength;
using (Stream datastream = response.GetResponseStream())
{
using (StreamReader sr = new StreamReader(datastream, System.Text.Encoding.UTF8))
{
result = sr.ReadToEnd();
sr.Close();
}

datastream.Close();
}

response.Close();
}

return result;
}