Función Hipotenusa

Public Class Form5
Dim a, b As Integer

Function hip(ByVal a As Integer, ByVal b As Integer)
hip = Math.Sqrt((a * a) + (b * b))
End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
a = TextBox1.Text
b = TextBox2.Text
Label3.Text = hip(a, b)
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Form6.Show()
End Sub
End Class