Assigning Nothing to a variable sets it to the default value for its declared type. : Nullable « Data Type « VB.Net Tutorial

1. VB.Net Tutorial
2. Data Type
3. Nullable

Module Module1
    Public Structure testStruct
        Public name As String
        Public number As Short
    End Structure

    Sub Main()

        Dim ts As testStruct
        Dim i As Integer
        Dim b As Boolean

        ' The following statement sets ts.name to "" and ts.number to 0.
        ts = Nothing

        ' The following statements set i to 0 and b to False.
        i = Nothing
        b = Nothing

        Console.WriteLine("ts.name: " & ts.name)
        Console.WriteLine("ts.number: " & ts.number)
        Console.WriteLine("i: " & i)
        Console.WriteLine("b: " & b)

    End Sub

End Module