private void PostUrlEncodedParams(HttpWebRequest request, KalturaParams kparams)
{
byte[] buffer;
string paramsString = kparams.ToQueryString();
buffer = System.Text.Encoding.UTF8.GetBytes(paramsString);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = paramsString.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(buffer, 0, buffer.Length);
requestStream.Close();
}