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

稍微修改了一下：

public List
   
     SelectDate        {            set            {                ViewState["sd"] = value;            }            get            {                if (ViewState["sd"] == null)                    ViewState["sd"] = new List
    
     ();                return (List
     
      )ViewState["sd"];            }        }        protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)        {            List
      
        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
       
         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() + "
        
");            }                  }
       
      
     
    
   

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