Area del Rectangulo En Visual Basic

Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim altura As Double, base As Double, area As Double
altura = Val(TextBox1.Text)
base = Val(TextBox2.Text)
area = altura * base
TextBox3.Text = areaEnd Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
TextBox1.Text = " "
TextBox2.Text = " "
TextBox3.Text = " "
End Sub

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
End
End Sub
End Class