Class in C#.Net

In C#.NET a class is a user defined Data type and is known as Reference Type

A class can contain following members in C#.NET

1. Data Fields

2. Functions

3. Constructors

4. Destructors

5. Properties

6. Indexers

7. Events

Diagrammatic representation of a class

A class is represented using rectangle symbol divided into three parts

 Data Fields

• It’s used to store the data related to the class
• Except Data Fields no other member of a class can store the data
• To declare any Data Field, we use the following
• Syntax: Access modifier Datatype Data Field Name [=Initializing value];
• Ex: Public int EmpId; string EName; Double salary;
• Access modifier can be any one of

            i)Private ii) Protected iii) internal iv) protected internal v) Public

• Default accessibility of a class in internal

 Functions

• Any programming language will have methods
• A method is a re-usable piece of a code which can be called again and again and used to perform required tasks
• In any programming language a method can be of two types:

         i) Procedures    ii) Functions

• A procedures is a method which doesn’t return any value to the calling place
• A function is a method which always will return single value to the calling place
• As a function will return some value to the calling place, mentioning return type as void
• Note: C#.Net will support only functions and doesn’t support procedures, whereas VB.Net will support both function and procedures.

Syntax to create a class: Access Modifier class ClassName

Syntax to create an object: Class Name Object Name=new Class Name ([argumentss list])

 Here Class Name is Constructor name