Design Patterns

3 Fundamental groups of Design Patterns

1.Behavioral
2.Creational
3.Structural

All about design patterns are here
http://www.gofpatterns.com/design-patterns/module2/three-types-design-patterns.php
https://csharpdesignpatterns.codeplex.com/

Ad-in for Visual studio
http://www.codeproject.com/Articles/767200/Visual-Studio-Design-Patterns-add-in
Code snippets:
http://snippets4dp.codeplex.com/releases/view/36428