gistfile1.txt

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";

var encodedBody = UTF8.GetBytes(postBody);

request.ContentLength = encodedBody.length;

var requestStream = request.GetRequestStream();

try
{
    requestWriter.Write(encodedBody, 0, encodedBody.length);
}
catch
{
    throw;
}
finally
{
    requestWriter.Close();
    requestWriter = null;
}

HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
    return sr.ReadToEnd();
}