Edit file info using rest api

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C#

C#4.0

OAuth

Hi,
I am using 4shared rest api, and working on edit file information by http put. I coded like this:

public void UpdateFile(string fileID, string accessToken, int uniqueID)
{
    Action<string> OnResponse = this.OnFileUpdate;
    string uri = string.Format("http://api.4shared.com/v0/files/fileID.json?oauth_token={1}&UniqueID={2}",accessToken,uniquesID);

    uri=uri + "&name=mayank&description=This is for testing.";
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(uri));            
    request.Method = "PUT";
    request.ContentType = "application/x-www-form-urlencoded";
    request.BeginGetResponse(delegate(IAsyncResult result)
    {
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(result);
        using (var stream = response.GetResponseStream())
        {
           using (StreamReader reader = new StreamReader(stream))
           {
               string response1 = reader.ReadToEnd();
               onResponseGot(response1);
           }
        }
    }, null);
}
    
private void OnFileUpdate(string result)
{
   if (!string.IsNullOrEmpty(result))
   {
      //do some code after file updates.
   }
}

Now I am getting response but with same old values. I also tried to test it on api console but result is same. I didn't find out the problem.