Source Code.

1. For Sudoku Solver.
Visit  www.codeproject.com

2. A Tool to view a LIB.
Visit CodeProject

3. Read and write Open XML files (MS Office 2007)
Visit http://www.codeproject.com/KB/office/OpenXML.aspx

4. How to create image thumbnails (image resizing) on the fly including watermark (text or image)
Visit http://www.codeproject.com/KB/web-image/runtimeimageresizing.aspx
  
5. Writing a Multiplayer Game (in WPF)
Visit http://www.codeproject.com/KB/WPF/RemoteGameSample.aspx 


more to come ...