oAuth/Gmail from ASP.NET - "The remote server returned an error: (400) Bad Request"

I have been banging my head on this for a long time now no avail. Hoping some fellow SOers can help out.

1. using oAuth.net library for the Gmail Contacts API

2. The 开发者_JAVA技巧request seems well-formed and I have stepped through the requests, and cannot discern anything wrong.

3. Tried checking if the timestamp is an issue - it seems that was a common issue on the gmail forums, tried changing to various time-zones, still no luck.

   public string WebResponseGet(HttpWebRequest webRequest) { StreamReader responseReader = null; string responseData = "";

   try
   {
       //This is where the exception is thrown
       responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
       responseData = responseReader.ReadToEnd();
   }
   catch (WebException ex)
   {
       Console.WriteLine(ex);
       throw;
   }
   finally
   {
       webRequest.GetResponse().GetResponseStream().Close();
       responseReader.Close();
       responseReader = null;
   }
   
   return responseData;
   

   }

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No real responses. Shutting it down.