webservice renew Token

[csupriest]

How do I renew a token. I want to use HttpWebrequest. Here is what I have so far


public override void PreExecute()
{
string Url = "

https://apig-qa.eip.css.test.com/oauth2/token";

string data = "code={0}&client_id={1}&client_secret={2}&refresh_token={3}&grant_type=refresh_token";
HttpWebRequest request = HttpWebRequest.Create(Url) as HttpWebRequest;
string result = null;
request.Method = "POST";
request.KeepAlive = true;
request.ContentType = "application/x-

http://www-form-urlencoded";

string param = string.Format(data, "" , "");
var bs = Encoding.UTF8.GetBytes(param);

using (Stream reqStream = request.GetRequestStream())

{
reqStream.Write(bs, 0, bs.Length);
}

using (WebResponse response = request.GetResponse())

{

var sr = new StreamReader(response.GetResponseStream());

result = sr.ReadToEnd();

sr.Close();

}


}