Before I forget, 101 C# Code Samples were recently added to MSDN (thanks Duncan)
, here are just some appetizers of the samples available:
Asynchronous/multithreaded programming * Socket Programming * Garbage Collection basics * Automating Internet Explorer in your applications * Encrypting and Decrypting data * Thread Pooling * Using Windows XP Themes
Sean and Scott did the original 101 VB code samples, and I believe they also worked on porting these to C#.