Rapaport Prices HTTP POST with WebRequest

string URL = "FILE_URL_PATH";
WebRequest webRequest = WebRequest.Create(URL);

webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
Stream reqStream = webRequest.GetRequestStream();
string postData = "username=myusername&password=mypassword";
byte[] postArray = Encoding.ASCII.GetBytes(postData);
reqStream.Write(postArray, 0, postArray.Length);
reqStream.Close();
StreamReader sr = new StreamReader(webRequest.GetResponse().GetResponseStream());
string Result = sr.ReadToEnd();