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
- The value type of data types
- Reference type data types
| Value type Data types | Reference type Data types |
| 1) Whenever a data type is derived from structure then it is said to be a value type data type. | 1) Whenever a data type is derived from a class definition then it is said to be a 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 memory | 2) The variable information will be maintained at the stack memory and the 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 supported | 3) Inheritance is supported. |
| 4) Default values will be assigned. Ex: integer à 0Boolean à false | 4) Default value for any reference type member will be a 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
- A default data type is an object.
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DIM (Dimensions):
It is the same as a 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 an 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:
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