How can I make the entered text be erased from the textbox?

Question

C++ / C#

Here is the code, it accepts only letters in the textbox, but you need to be able to erase the entered text:

private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            e.Handled = (e.KeyChar == (char)Keys.Space);
            string Symbol = e.KeyChar.ToString();

            if (!Regex.Match(Symbol, @"[а-яА-Я]|[a-zA-Z]").Success)
            {
                e.Handled = true;
            }
        }

Answer 1

if (e.KeyChar != (char)Keys.Back && !Regex.Match(Symbol, @"[а-яА-Я]|[a-zA-Z]").Success)

See https://toster.ru/q/635163, answer and comments