日期控件的e.Cell增加一个事件SelectionChanged

DataView dv;
        if (e.Day.IsOtherMonth)
        {
            e.Cell.Text = "";
        }
        else
        {
            e.Cell.CopyBaseAttributes(DayLogCalendar);  
   //如何增加一个事件DayLogCalendar
            dt = Pdl.GetTitle(ViewState["id"].ToString(), e.Day.Date.ToString("yyyy-MM-dd"));
            int j = dt.Rows.Count;
            string stem = "";
            if (j> 0)
            {
                for (int i = 0; i < 1; i++)
                {
                    stem ="内容："+ dt.Rows[0]["Content"].ToString();
                    if (stem.Length > 7)
                    {
                        stem=stem.Substring(0, 7) + "...";
                    }
                    e.Cell.Controls.Add(new LiteralControl("<br/><a id=" + dt.Rows[0]["ID"].ToString() + "' target='_self' title='" + dt.Rows[0]["Content"].ToString() + "')>" + stem + "</a>"));
                }
            }
            else
            {
                for (int i = 0; i < 1; i++)
                {
                    e.Cell.Controls.Add(new LiteralControl("<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"));
                }
            }
        } protected void DayLogCalendar_SelectionChanged(object sender, EventArgs e)
    {
        this.ErrorLb.Text = "";
        this.ContentTB.Text = "";
        string date=this.DayLogCalendar.SelectedDate.ToString("yyyy-MM-dd");
        dt = Pdl.GetTitle(ViewState["id"].ToString(),date);
        if (dt.Rows.Count != 0)
        {
            ViewState["DayLogID"] = dt.Rows[0]["ID"].ToString();
            this.ContentTB.Text = dt.Rows[0]["Content"].ToString();
            this.addBt.Text = "修　改";
            this.delBt.Visible = true;
        }
        else
        {
            ViewState["DayLogID"] = "";
            this.addBt.Text = "添　加";
            this.delBt.Visible = false;
        }
    }