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' Variable first is a nullable type.
Dim first? As Integer = 3
Dim second As Integer = 6
' Variable first <> Nothing, so its value, 3, is returned.
Console.WriteLine(If(first, second))
second = Nothing
' Variable first <> Nothing, so the value of first is returned again.
Console.WriteLine(If(first, second))
first = Nothing
second = 6
' Variable first = Nothing, so 6 is returned.
Console.WriteLine(If(first, second))