Calcular la sumatoria de las N potencias de N Codigo Fuente en Visual Basic

Problema
Hacer un programa o algoritmo, que dado N calcular:(1¹)+(2²)+(3³)+......+(N^N)

Codigo Fuente en Visual Basic

Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object,
    ByVal e As System.EventArgs) Handles Button1.Click
        Dim sum As Double = 0
        Dim n As Integer
        n = TextBox1.Text
        For i As Integer = 1 To n
            sum = sum + Math.Pow(i, i)
        Next i
        TextBox2.Text = Trim(sum)
    End Sub
End Class

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