1-Main Method ():

2-Reading And Writing to the Console:

3-Datatypes

4-Common Operator

5-Arrays

6-Comments

7-Control Flow

8-Namespaces

9-Class

10-Methods

11-Modifiers

12-Inheritance

13-Polymorphism

14-Encapsulation

15-Objects

16-Structures

17-interfaces

18-Abstract Class:

19-Delegates:

20-Enums: