private void OnTextValidating(object sender, TextValidatingEventArgs e)
        {
            var styles = RadioButtonHexadecimal.Checked ? NumberStyles.HexNumber : NumberStyles.Integer;

            if (_value is long)
            {
                e.Cancel = !long.TryParse(e.NewText, styles, null, out long l);
            }
            else
            {
                e.Cancel = !int.TryParse(e.NewText, styles, null, out int i);
            }
        }
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            if (_dontProcessMessages)
            {
                return;
            }

            const int WM_KEYDOWN   = 0x100;
            const int WM_ENTERIDLE = 0x121;
            const int VK_DELETE    = 0x2e;

            bool delete = m.Msg == WM_KEYDOWN && (int)m.WParam == VK_DELETE;

            if ((m.Msg == WM_KEYDOWN && !delete) || m.Msg == WM_ENTERIDLE)
            {
                DontProcessMessage(() =>
                {
                    _validText      = Text;
                    _selectionStart = SelectionStart;
                    _selectionEnd   = SelectionLength;
                });
            }

            const int WM_CHAR  = 0x102;
            const int WM_PASTE = 0x302;

            if (m.Msg == WM_CHAR || m.Msg == WM_PASTE || delete)
            {
                string newText = null;
                DontProcessMessage(() =>
                {
                    newText = Text;
                });

                var e = new TextValidatingEventArgs(newText);
                OnTextValidating(this, e);
                if (e.Cancel)
                {
                    DontProcessMessage(() =>
                    {
                        Text            = _validText;
                        SelectionStart  = _selectionStart;
                        SelectionLength = _selectionEnd;
                    });
                }
            }
        }
 protected virtual void OnTextValidating(object sender, TextValidatingEventArgs e) => TextValidating?.Invoke(sender, e);