Generices

http://msdn.microsoft.com/en-us/library/512aeb7t(VS.80).aspx
http://www.c-sharpcorner.com/UploadFile/sdhar8po/GenericsInCSharp11152005055344AM/GenericsInCSharp.aspx
http://www.csharp-station.com/Tutorials/Lesson20.aspx
http://www.codeproject.com/Articles/8360/Generics-in-C-2-0