VB .NET - Inverter Caracteres

Public Class Form1

    Function InvertirString(ByVal str As String) As String

        Dim Invertir As String

        Dim ArrChar() As Char = str.ToCharArray()

        Array.Reverse(ArrChar)

        Invertir = ArrChar

        Return Invertir

    End Function

    Private Sub btnInverter_Click(sender As Object, e As EventArgs) Handles btnInverter.Click

            Me.TextBox1.Text = InvertirString(Me.TextBox1.Text)     

    End Sub

End Class

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Espero ter ajudado... até mais, abraços!