There is now a simple Facebook ASP.NET C# template available on GENNIT (completely free no pro subscription required) that works out of the box with Facebook.

Creating a new web application in Visual Studio or Visual Studio Express and replacing the codebehind file default.aspx.cs with the one provided by GENNIT creates a simple working Facebook API based web application.

It also contains an example to get setFBML working in ASP.NET (providing you modify the FacebookService.cs to include the function available here).

Create a Free account at GENNIT and add a new project with a generator type of ‘Facebook ASP.NET C#’.