How do I get text of label when changed to server side?

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VB

ASP.NET

Javascript

jQuery

Hello,

I'm trying to assign the text of a label to a hidden field when not post back but I fail. This is what I done.

If Not IsPostBack Then
            Dim structPayperiod As strcPayperiodDet


            structPayperiod = objTimeSystem.getCurrentPayPeriod()
            hdnPayperiodseq.Value = structPayperiod.Payperiodid
            hdnPayPeriodStartDt.Value = structPayperiod.startdate.ToString

            lblPayPeriodStartDt.Text = structPayperiod.startdate

            displayPayrollIdOrgs(objTimeSystem.getPayrollIDOrgs())

            grd_Employees.Visible = False

            RptErrorsMessages.DataSource = objTimeSystem.getErrorMessages()
            RptErrorsMessages.DataBind()
        Else
            hdnPayPeriodStartDt.Value = lblPayPeriodStartDt.Text.ToString

        End If

Problem comes in else clause where the value doesn't get update with new label value. lblPayPeriodStartDt.Text is not updating.

The value of label is date and it updates every time I change the date using calender control on client side. But, the value of the label doesn't refresh with that value.

<img src="../Images/calendar.gif" class="clsCursorHand" alt="" title="Select Pay Period"
                             önclick="Javascript:PayPeriodsPayroll('<%=lblPayPeriodStartDt.ClientId %>',event);"/>