txtbox取Calendar值

 protected void Page_Load(object sender, EventArgs e)
        {

         this.Limited_Calendar.Attributes.Add("style", "display:none;border-width:1px;border-style:solid;border-collapse:collapse;z-index: 100; left: 0px;");
         this.txt_limitedDateTime.Attributes.Add("onfocus", "javascript:document.getElementById('<%=Limited_Calendar.ClientID %>').style.display=''");
        
        
        }

        protected void btn_save_Click(object sender, EventArgs e)
        {

        }

        protected void Limited_Calendar_SelectionChanged(object sender, EventArgs e)
        {
          this.txt_limitedDateTime.Text = this.Limited_Calendar.SelectedDate.ToShortDateString();

          this.Limited_Calendar.Attributes.Add("onblur", "javascript:document.getElementById('<%=Limited_Calendar.ClientID %>').style.display='none'");
        }