Public Class Form1
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
TextBox1.Text = ""
TextBox2.Text = ""
TextBox3.Text = ""
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
TextBox3.Enabled = False
TextBox3.Text = Val(0.5) * Val(TextBox1.Text) * Val(TextBox2.Text)
End Sub
End Class
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