protected override void OnTextChanged(EventArgs e)
        {
            try
            {
                if (!string.IsNullOrEmpty(this.Text))
                {
                    int maxLength = InputType == InputTypeEnum.Dec ? 3 : 2;
                    if (Text.Length > maxLength)
                    {
                        StringBuilder removedText = new StringBuilder();
                        Text = removedText.Append(this.Text).Remove(maxLength, this.Text.Length - maxLength).ToString();
                    }
                    if (Convert.ToInt32(this.Text, (int)InputType) > 255)
                        Text = InputType == InputTypeEnum.Dec ? "255" : "FF";
                    else if (Convert.ToInt32(this.Text, (int)InputType) < 0)
                        Text = "00";
                }
                base.OnTextChanged(e);
            }
            catch { this.Text = "0"; }
        }