Scope rules and instance variables : Instance Variables « Class « VB.Net

1. VB.Net
2. Class
3. Instance Variables

Scope rules and instance variables

Imports System

Public Class MainClass
   ' instance variable can be used anywhere in class
   Shared Dim value As Integer = 1

    Shared Sub Main(ByVal args As String())
      ' variable local to FrmScoping_Load hides instance variable
      Dim value As Integer = 5

      Console.WriteLine( "local variable value in" & _
         " FrmScoping_Load is " & value )

      MethodA() ' MethodA has automatic local value
      MethodB() ' MethodB uses instance variable value
      MethodA() ' MethodA creates new automatic local value
      MethodB() ' instance variable value retains its value

      Console.WriteLine( vbCrLf & vbCrLf & "local variable " & _
         "value in FrmScoping_Load is " & value )

    End Sub

   ' automatic local variable value hides instance variable
   Shared Sub MethodA()
      Dim value As Integer = 25 ' initialized after each call

      Console.WriteLine( vbCrLf & vbCrLf & "local variable " & _
         "value in MethodA is " & value & " after entering MethodA" )
      value += 1
      Console.WriteLine( vbCrLf & "local variable " & _
         "value in MethodA is " & value & " before exiting MethodA" )
   End Sub ' MethodA

   ' uses instance variable value
   Shared Sub MethodB()
      Console.WriteLine( vbCrLf & vbCrLf & "instance variable" & _
         " value is " & value & " after entering MethodB" )
      value *= 10
      Console.WriteLine( vbCrLf & "instance variable " & _
         "value is " & value & " before exiting MethodB" )
   End Sub ' MethodB

End Class

           
       

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