pls Help ~ thx ^_^

Question

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged TextBox1.Text = 10 End Sub Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged TextBox2.Text = 10 End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox3.Text = TextBox1.Text + TextBox2.Text End Sub End Class ------------------------------------------------------------------------------------------ %% why textbox3 text = 1010 ? %% How To be 20? Pls help!!!!!!!! ^_^