How to correctly write a condition for backspace?

Question

C++ / C#

Everything works fine with numbers. And the backspace still does not understand. I also tried to write 'Back'

if ((e.KeyChar == (char)Keys.Enter) || (e.KeyChar < (char)Keys.D0 || e.KeyChar > (char)Keys.D9) || (e.KeyChar == 8))
            {
                e.Handled = true;
            }

Answer 1

stackoverflow.com/questions/10288939/how-can-i-det...