show results from values in text boxes on clicking or pressing tab button

[Durairajmbd]

I am developing application software.entering two textbox value,while click or pressing tab button in third textbox, the result needs to show in third textbox.

[gvuksa]

Use Enter event in Properties window in events.
When you enter texbox it will show result.

private void tbRes_Enter(object sender, EventArgs e)
        {
            // Do calculation that you want
            double res = double.Parse(tb1.Text) + double.Parse(tb2.Text);
 
            // Pass result to textbox
            tbRes.Text = res.ToString();
        }