Local variable shadows global variable with the same name : Variable Scope « Language Basics « VB.Net Tutorial

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VB.Net Tutorial » Language Basics » Variable Scope 
1.5.8.Local variable shadows global variable with the same name
Module Module1

    Dim Counter As Integer

    Sub BigLoop()
        For Counter = 1000 To 1005      ' Use global Counter
            Console.Write(Counter & " ")
        Next
    End Sub

    Sub LittleLoop()
        Dim Counter As Integer

        For Counter = To 5      ' Use local Counter
            Console.Write(Counter & " ")
        Next
    End Sub

    Sub Main()
        Counter = 100

        Console.WriteLine("Starting Counter: " & Counter)
        BigLoop()
        Console.WriteLine("Counter after BigLoop: " & Counter)
        LittleLoop()
        Console.WriteLine("Counter after LittleLoop: " & Counter)

        If (Counter > 1000Then
            Dim Counter As Integer = 0

            Console.WriteLine("Counter in If statement: " & Counter)
        End If

        Console.WriteLine("Ending Counter: " & Counter)
    End Sub

End Module
Starting Counter: 100
1000 1001 1002 1003 1004 1005 Counter after BigLoop: 1006
0 1 2 3 4 5 Counter after LittleLoop: 1006
Counter in If statement: 0
Ending Counter: 1006
1.5.Variable Scope
1.5.1.Demonstrates scope rules and instance variables
1.5.2.Block scope
1.5.3.Variable block scope
1.5.4.Variable scope in try catch statement
1.5.5.Define variable inside If statement
1.5.6.Sub scope
1.5.7.Function local variables
1.5.8.Local variable shadows global variable with the same name
1.5.9.Module global variable
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