Partial classes and Partial Methods

http://msdn.microsoft.com/en-us/library/6b0scde8.aspx

http://www.codeproject.com/Articles/313352/4-real-time-use-of-Partial-classes-and-partial-met
http://www.dotnet-tricks.com/Tutorial/csharp/8TUF161012-Partial-Methods-in-C-Sharp-with-example.html
http://msdn.microsoft.com/en-us/library/wa80x488.aspx