Data Types and variables in vb.net

Data type:

It is used to specify the type of value that can be assigned to the member.

 

Note:

VB.Net supports two types of data types

  • Value type data types
  • Reference type data types

 

Value type Data typesReference type Data types
1) Whenever a data type is derived from structure then it is said to be value type data type.1) Whenever a data type is derived from a class definition then it is said to be value type data type.
2) The variable information and the value will be maintained at the stack memory.Ex: public I as integer = 10I [10] s to 3 stack memory2) The variable information will be maintained at the stack memory and value will be maintained at heap memory.Ex: public S as string = VB.NetS[H10T] 5105stack memory ----> [vbrowser] H107 heap memory
3) Inheritance is not supported3) Inheritance is supported.
4) Default values will be assignedEx: integer à 0Boolean à false4) Default value for any reference type member type member will be null value.
5) value type data types are bytes, s bytes, integer, u integer, short, u short, long, double, decimal, Boolean, char, date time, enum & structure etc.5) Reference type data types are string, object, interface, delegate and class.

 

 

Observation:

  • The default modifier is private
  • The default data type is an object.

 

DIM (Dimensions):

It is same as private modifier but the difference is the DIM modifier can be used anywhere within the application.

‘‘Demo on members

Imports system

Module Members ‘‘Demo

Class Test

Public is as integer instance member

Public shared as integer shared member

End class

Sub main ( )

Test.s = 100

Dim t1 As New Test

t1.i = 1000

Dim t2 As New Test

t2.i = 2000

Console.Writeline (“{0}, {1}, {2}”, Test.S, t1.i, t2.i)

End sub

End Module

 

Observation:

Screenshot_24