Development VB.Net Tutorial

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public class Test
   public Shared Sub Main
        #If UseFastAlgorithm Then
            Console.WriteLine("Fast")
        #Else
            Console.WriteLine("Slow")
        #End If
        
        #Const UseFastAlgorithm = True
        
        #If UseFastAlgorithm Then
           Console.WriteLine("Fast")
        #Else
           Console.WriteLine("Slow")
        #End If
   End Sub
End class
Slow
Fast