Ok, so I downloaded a class online (OAuthBase.cs). Every time I plug it into my project, I am getting "The name 'HttpUtility' does not exist in the current context" error.

I got this from the following site: http://oauth.googlecod e.com/svn/code/csharp/OAuthBase.cs

Here is the code I am trying to use:

Code:
using System;
using System.Security.Cryptography;
using System.Collections.Generic;
...