Nice collection of samlple code for Visual Studio 2005 both in C# an VB.Net. http://msdn.microsoft.com/vstudio/downloads/101samples/default.aspx. The samples include:

• Changing ACL (Access Control Lists) on files
• Console Enhancements including buffer control, simple animations and colors
• Downloading files using FTP (File Transfer Protocol)
• Network Programming including PING, UDP, and TCP network statistics
• Using the new Stopwatch class to measure time
• Compressing and decompressing files in the GZip format
• Retrieving Drive Information
• Using Generic Collections
• Creating Regular Expressions to parse text
• Building a tracing infrastructure to track errors and application performance
• Controlling cache policies with the new System.Net.Cache namespace
• Creating a process viewer
• Creating a Windows service manager
• Using the data protection API
• Encrypting and decrypting data
• Using platform invoke to access legacy or unmanaged code from within managed code
• Building in support for localization
• Using the NGEN utility
• Using the new SecureString class
• Using new socket class methods
• Using serial ports with the new Port class
• Working with the file system
• Working with threads to manage multiple tasks simultaneously
• Building a simple web server with HTTPListener

And a lot more, check it out!