Using a textBox for alert

Question

Hi!

 

I would like to make a textbox alerting when I make an operation. These codes work well. But I need to use a Textbox to boot an alert.

 

private void textBox3_TextChanged(object sender, EventArgs e)

{

string s = (sender as TextBox).Text;

int i = Convert.ToInt16(s);

if (i > 5)

{

MessageBox.Show("Number greater than 5");

(sender as TextBox).Focus();

}

}

 

For instance, TextBox1.Text + TextBox2.Text = TextBox3.Text //If the answer its more than five (5). Then popup the message.