C# TextBox十六(16)進位資料輸入限制函數

        private void TextBoxDataCheck(TextBox txt, KeyPressEventArgs e,int intLen)//16進位資料輸入限制函數
        {
            if (e.KeyChar == 8)//刪除鍵要直接允許
            {
                e.Handled = false;
            }
            else
            {
                if (txt.Text.Length < intLen)//長度限制在8
                {
                    if ((e.KeyChar >= 'a' && e.KeyChar <= 'f') || (e.KeyChar >= 'A' && e.KeyChar <= 'F') || (e.KeyChar >= '0' && e.KeyChar <= '9'))//限制0~9和A~F
                    {
                        e.Handled = false;
                    }
                    else
                    {
                        e.Handled = true;
                    }
                }
                else
                {
                    e.Handled = true;
                }
            }
        }
        private void txtcpu001_KeyPress(object sender, KeyPressEventArgs e)
        {
            TextBoxDataCheck(txtcpu001, e, 32);
        }