Enabling keypress KeyChar

Hi,
I want to enable "-" inside the if statement what should i add to include it?
Is there a list of Chars i can refer to incase i want to add in other characters in the future.

Thanks for the help in advcance

if (!char.IsLetterOrDigit(e.KeyChar) && e.KeyChar != '\b')
            {
                e.Handled = true;
            }

Select allOpen in new window