I am using Ajax Timer control in my OnlineTest Application. suppose if exam duration 45 mintes means i am adding 45 minutes to server time and i am subtracting with current server time and i will get 45 minutes with that i am reducing time in the form of seconds like 45:59,45:58. I am using ASP.Net 2.0,Ajax1.0, MS Access Database. but during postback means if i click on "Next" button(next question will appear in the next page) that time i am not able to maintain time what ever time it has taken during postback again from that i am able to continue again..please could u help me regard in this this is my aspx page <asp:UpdatePanel runat="server" ID="uppnlTimer" RenderMode="Inline" UpdateMode="Conditional"> <triggers> <asp:AsyncPostBackTrigger ControlID="tmrTest" EventName="Tick" /> </triggers> <contenttemplate> <asp:Timer ID="tmrTest" runat="server" OnTick="tmrTest_Tick" Interval="1000"> </asp:Timer> <asp:Label runat="server" ID="lblStartTime" Text="Start Time:" CssClass="lbl" /> <asp:Label runat="server" ID="lblStartTimeValue" CssClass="lblbold" /> <asp:HiddenField ID="hid_Ticker" runat="server" Value="0" /> </contenttemplate> </asp:UpdatePanel> this is Code behind code protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { DataSet dsServerTime = new DataSet(); DataSet dsExamTime = new DataSet(); dsServerTime = objOnlineTestPaperBAL.GetServerTime(); dsExamTime = objOnlineTestPaperBAL.GetServerTimeWithExamDuration(ExamTime); if (dsServerTime.Tables[0].Rows.Count > 0) { string serverTime = dsExamTime.Tables[0].Rows[0]["ExamTime"].ToString(); minutes = Convert.ToInt32(serverTime); hid_Ticker.Value = new TimeSpan(Hours, minutes, seconds).ToString(); if (Session["time"] != null) { string time = (string)Session["time"]; string[] str1 = time.Split(':'); minutes = Convert.ToInt32(str1[1]); seconds = Convert.ToInt32(str1[2]); lblStartTimeValue.Text = Convert.ToString(minutes) + " : " + Convert.ToString(seconds); hid_Ticker.Value = new TimeSpan(Hours, minutes, seconds).ToString();