Auto Refresh specific section at regular intervals of page using UpdatePanel in ASP.Net

Try This

<asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:Timer ID="Timer1" runat="server" Interval="10000" ontick="Timer1_Tick">
            </asp:Timer>
            
        </ContentTemplate>
    </asp:UpdatePanel>

.cs

protected void Timer1_Tick(object sender, EventArgs e)
    {
        //UpdateDataList(); //You need use this method to refresh the DataList.
    }

 or

http://www.asp.net/web-forms/videos/aspnet-ajax/how-do-i-use-the-aspnet-ajax-timer-control