.net日历控件 Calendar选择多个日期

来源：http://dev.mjxy.cn/a-Calendar-calendar-control-multiple-dates-selection.aspx

稍微修改了一下：

 public List<DateTime> SelectDate        {            set            {                ViewState["sd"] = value;            }            get            {                if (ViewState["sd"] == null)                    ViewState["sd"] = new List<DateTime>();                return (List<DateTime>)ViewState["sd"];            }        }        protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)        {            List<DateTime> selectDate = SelectDate;            foreach (var item in SelectDate)            {                if (e.Day.IsOtherMonth)                    e.Cell.Controls.Clear();                if (e.Day.Date == item)                    e.Cell.BackColor = System.Drawing.Color.Red;            }        }        protected void Calendar1_SelectionChanged(object sender, EventArgs e)        {            List<DateTime> lst = SelectDate;            if (lst.Contains(Calendar1.SelectedDate))            {                lst.Remove(Calendar1.SelectedDate);            }            else            {                lst.Add(Calendar1.SelectedDate);            }        }        protected void Button1_Click(object sender, EventArgs e)        {            foreach (var item in SelectDate)            {                Response.Write(item.ToString() + "<BR/>");            }                  }