From Facebook Developer Wiki

Tutorials

• How to write a facebook application using ASP.NET by Kayson Wong

Libraries

• Facebook Developer Toolkit (note the showcase) - For issues and discussions about the Toolkit see the project on Codeplex.
• .NET Facebook API Client (alpha release) - Developed by SocialCash, Demo App
• Facebook Developer Toolkit Addon for ASP.NET MVC
• Jay Lagorio also created a VB.NET client library. This is linked from the main developer page.
• VS.NET 2008 Starter Kit for creating Facebook applications using Facebook Developer Toolkit v2.1
• Facebook.NET: Introduction and CodePlex Project - an open source .net Facebook application framework optimized for the ASP.NET programming model - use with either C# or VB.NET.
• fbasync: An Asynchronous Facebook API for .NET designed to scale. Read the introduction blog entry.
• Facebook Connect Authentication for ASP.NET A small library that helps identify and verify Facebook Connect users in your ASP.NET application.

Samples

cSharp InLine Publisher - sample May 2009 using FDT 2.0