Using SendKeys in C#

SendKeys is very powerful. You can use SendKeys to send a different keycode from the one that was pressed. For example:

private void TextBox1_KeyDown(object sender, KeyEventArgs e)
        {

            if (e.KeyCode == Keys.Right)
            {
                SendKeys.Send("{TAB}");
            }
            if (e.KeyCode == Keys.Left)
            {
                SendKeys.Send("+{TAB}");
            }

       }

"Presses" tab when the Left or Right arrow keys are pressed.