Windows Media Service 2008 authentication plug-in sample?

Question

Hello everyone,

I am using VSTS 2008 + C# + .Net 3.5 + Windows Media Service 2008 on Windows Server 2008. I want to develop a custom authentication sample. I want to use C#. But what I find is C++ samples. For example,

http://msdn.microsoft.com/en-us/library/dd892688%28VS.85%29.aspx

Any simple C# samples?

thanks in advance, George