introduction to Class & Members in vb.net

Class:

It is used to define a user-defined reference type datatype member.  

Syntax:

Class Class Name

Members

. . . . .

End class  

Note: Members of the class is of two types

• Instance members
• Shared members

Instance members:

These members are bound to the objects defined for the class and they can be accessed using the object name.  

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Shared members:

These members belong to the class definition and they can be accessed using the class name. Shared members will be loaded on the memory when the class definition is headed.  

Object:

The instance of a class is called an object.

Note:

• Objects occupy the physical memory
• Objects are always isolated i.e. the values assigned for the members of one object will not be reflected for the members of other objects.

Syntax:

Modifier object name as new Class Name ([. . .])      

Variable:

These are the place holders for maintaining a value based on the data type used for defining the variable.  

Syntax:

Modifier variable name as Datatype [=value]  

Modifier:

These are the access specifiers that are used to control the access of the members.

Note: All the above modifiers can be used within a module and class. But these modifiers can’t be used from the methods.  

Ex:

Module M1

Public I as integer ‘valid’

Class C1

Public j as integer ‘valid’

End class

Sub main ( )

‘Public K as integer error

End sub

End module

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