Calling & receiving response of any webpage C# - ASP.Net

public void CallWebPage(string url)
{
    WebRequest request = WebRequest.Create(url);
    //WebProxy proxy = new WebProxy("fresproxy1:8080");
    //proxy.UseDefaultCredentials = true;
    //request.Proxy = proxy;
    request.Headers.Add("Key", Value);
    request.Headers.Add("Key", Value);
    WebResponse objWebResponse = request.GetResponse();
    Stream objWebStream = objWebResponse.GetResponseStream();
    string response = "";
    string OAuthToken="";
    using (StreamReader objStreamReader = new StreamReader(objWebStream))
    {
        response = objStreamReader.ReadToEnd();
    }
    //if response is json - deserialize that into dictionaries for easier operation - System.Web.Extensions.dll
   JavaScriptSerializer desSSO = new JavaScriptSerializer();
   IDictionary userInfo = desSSO.Deserialize<Dictionary<string, string>>(response);
   foreach (DictionaryEntry entry in userInfo)
   {
       if (entry.Key.ToString() == "abc")
       {
           OAuthToken = entry.Value.ToString();
       }
   }
}