01.Public Sub TextBox1_TextChanged(sender As Object, e As System.EventArgs) Handles TextBox1.TextChanged
02. If TextBox1.Text <> "" And TextBox2.Text <> "" Then
03. TextBox3.Text = TextBox1.Text * TextBox2.Text
04.
05. End If
06.
07. End Sub
08.
09. Public Sub TextBox2_TextChanged(sender As Object, e As System.EventArgs) Handles TextBox2.TextChanged
10. If TextBox1.Text <> "" And TextBox2.Text <> "" Then
11. TextBox3.Text = CDbl(TextBox1.Text) + CDbl(TextBox2.Text)
12.
13. End If
14. End Sub
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