Dynamically update a label in DayPilot Calendar

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C#

ASP.NET

Hi.

I have a 3rd party calendar control (day pilot pro) and a label on my form.

i want my label to show the week number when a user clicks on any date on the calendar. My week number calculating method is working fine but my label does not update automatically. when I debug,I can see that my label.text has the right value, but it does not reflect on the page.

any good idea?? or label is not a suitable control for this purpose??

protected void Page_Load(object sender, EventArgs e)
{
            if (!IsPostBack)
            {
                DayPilotCalendar1.StartDate = DayPilot.Utils.Week.FirstWorkingDayOfWeek(DateTime.Now);
                DayPilotCalendar1.Days = 7;
                DayPilotCalendar1.BusinessBeginsHour = 6;
                DayPilotCalendar1.BusinessEndsHour = 24;
                lblWkNumber.Text = "Week Number: " + gl.getWeekNumber(DayPilotCalendar1.StartDate); // displaying the week number
               
                string strMonthName = mfi.GetMonthName(DayPilotCalendar1.StartDate.Month).ToString();
                lblMonth.Text = strMonthName; //displaying the month name.
             }
}

protected void DayPilotCalendar1_Command(object sender, DayPilot.Web.Ui.Events.CommandEventArgs e)
        {
            if (e.Command == "navigate")
            {
                DateTime dt = (DateTime)e.Data["start"];
                DayPilotCalendar1.StartDate = DayPilot.Utils.Week.FirstWorkingDayOfWeek(dt);
                lblWkNumber.Text = "Week Number: " + gl.getWeekNumber(DayPilotCalendar1.StartDate); // here i am changing the week number but it does not work !!

              
                DayPilotCalendar1.DataBind();
                DayPilotCalendar1.Update(CallBackUpdateType.Full);
               
            }