VB.Net/Language Basics/Not

If with not Equals

Imports System
Public Class MainClass
    Shared Sub Main()
        Dim strName As String
        strName = "GRE"
        "Is the name Gretchen?
        If strName <> "Gre" Then
            System.Console.WriteLine("The name is *not* Gre.")
        End If
    End Sub
End Class

Truth table for Not

Imports System
Public Class MainClass
    Shared Sub Main(ByVal args As String())
      " create truth table for Not
      Console.Write("Not" & vbCrLf & "Not False: " & _
         (Not False) & vbCrLf & "Not True: " & (Not True) & _
         vbCrLf & vbCrLf)
    End Sub
End Class