Not being a C# expert, I used many resources to create this project. Aside from reading several books and articles, I also got troubleshooting help from a friend, Jeff, who teaches programming (using C#).

Credits
Code
Filters: article at the code project by Christian Gaus
Traversing directories: article at MSDN
Encoding bitmaps: article at MSDN on Base64 conversion
Troubleshooting and tips: Jeff Meyers

Books
Professional C#, 2nd Edition by Simon Robinson, et. al.
Programming C# by Jesse Liberty
Windows Forms: Programming with C# by Erik Brown
C# Cookbook by Stephen Teilhet & Jay Hilyard