C# 28 categories

1 2D Graphics

2 ADO Database

3 Class Interface

4 Collections Data Structure

5 Components

6 Data Types

7 Date Time

8 Design Patterns

9 Development Class

10 Event

11 File Stream

12 Generics

13 GUI Windows Form

14 Internationalization

15 Language Basics

16 LINQ

17 Network

18 Office

19 Reflection

20 Regular Expressions

21 Security

22 Services Event

23 Thread

24 Web Services

25 Windows

26 WPF

27 XML

28 XML LINQ