private int GetUpdateTime()
        {
            int updateTime;

            try
            {
                updateTime = BooEval.GetInt32(_intervalTextBox.Text);
            }
            catch
            {
                updateTime = 300;
            }
            return(updateTime);
        }
        private void NumberTextBoxKeyUp(object sender, KeyEventArgs e)
        {
            int newNumber;

            try
            {
                newNumber = BooEval.GetInt32(textBoxNumber.Text);
            }
            catch
            {
                return;
            }
            Number = newNumber;
            Preview();
        }