C# 两个textBox控件调用同一个monthCalendar输入日期

C# 多个textBox控件调用同一个monthCalendar输入日期:代码如下

需要添加textBox1+textBox2+monthCalendar1控件

DateTime FirstClick;
        int TextBoxNumber;
        private void textBox1_Click(object sender, EventArgs e)
        {
            this.TextBoxNumber = 1;
            this.monthCalendar1.Visible = true;
        }

        private void textBox2_Click(object sender, EventArgs e)
        {
            this.TextBoxNumber = 2;
            this.monthCalendar1.Visible = true;
        }

       /// <summary>
        /// 日期控件调用函数
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void monthCalendar1_DateSelected(object sender, DateRangeEventArgs e)
        {
            if (this.TextBoxNumber == 1)
            {
                MonthCalendarDoubleClick(this.textBox1, this.monthCalendar1);
            }
            else
            {
                MonthCalendarDoubleClick(this.textBox2, this.monthCalendar1);
            }
        }      
        /// <summary>
        /// 双击日期控件调用函数
        /// </summary>
        /// <param name="SelectedTextBox"></param>
        /// <param name="monthCalendar"></param>
        private void MonthCalendarDoubleClick(TextBox SelectedTextBox, MonthCalendar monthCalendar)
        {
            DateTime SecondClick = DateTime.Now;//记录下第二次单击时间;
            string ClickSpan = Convert.ToString(SecondClick - FirstClick);//计算两次单击的时间间隔;格式为:00:00:00.1875000
            string Separator = ":.";
            char[] CharClickSpan = Separator.ToCharArray();
            string[] arrayClickSpan = ClickSpan.Split(CharClickSpan);
            if (arrayClickSpan.Length == 4 && arrayClickSpan[0].Equals("00") && arrayClickSpan[1].Equals("00") && arrayClickSpan[2].Equals("00"))
            {
                if (Convert.ToInt32(arrayClickSpan[3].Substring(0, 3)) > SystemInformation.DoubleClickTime)//如果两次单击的时间间隔大于系统双击时间;
                {
                    FirstClick = SecondClick;//赋第二次单击时间给第一次;
                }
                else
                {
                    //两次单击的时间间隔小于或者等于喜欢双击时间
                    SelectedTextBox.Text = monthCalendar.SelectionStart.ToString("yyyy-MM-dd");//把双击选中的文本赋给TextBox;
                    this.monthCalendar1.Visible = false;
                }
            }
            else
            {
                FirstClick = SecondClick;
            }
        }