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vb.net using and or andalso

Hello,
I would like to know what are the options of using And or AndAlso to get the same results that I have here..

    Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
        If MyIPAddress = "0" Then
            If MyIPAddress = OldIPAddress Then
                If MyIPAddress.StartsWith("168.") Then
                    If MyIPAddress.StartsWith("169.") Then
                        If MyIPAddress.StartsWith("192.") Then

                                Debug.Print("all good")

                        End If
                    End If
                End If
            End If
        End If
    End Sub

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Meir Rivkin

here:

    Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
        If MyIPAddress = "0" AndAlso 
MyIPAddress = OldIPAddress AndAlso  
MyIPAddress.StartsWith("168.") AndAlso 
MyIPAddress.StartsWith("169.") AndAlso 
MyIPAddress.StartsWith("192.") Then
                                Debug.Print("all good")

                        End If
                    End If
                End If
            End If
        End If
    End Sub

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kaufmed

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5teveo

Not sure logic above makes sense...
If MyIPAddress = "0" then address can not be another value to test inside If block...

Maybe...

Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
If MyIPAddress <> "0" Then
If MyIPAddress <> OldIPAddress Then
If MyIPAddress.StartsWith("168.") OR _
MyIPAddress.StartsWith("169.") OR _
MyIPAddress.StartsWith("192.") Then
Debug.Print("all good")
End If
End If
End If
End Sub

Éric Moreau

you should not use or/and (but prefer orelse/andalso).

the explanation is at http://emoreau.com/Entries/Articles/2008/04/Short-circuiting-mainly-in-VBNet-and-SQL-Server.aspx