Refresh Gridview without Refreshing the Whole-page (ASP.Net)

Question

How to refresh the gridview without refreshing the whole-page?

I have this code:

<asp:Timer ID="Timer1" runat="server" Interval="3600000">
</asp:Timer>

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
    </Triggers>
    <ContentTemplate>
        <asp:Panel ID="Panel1" runat="server" Height="250px"  Width="250px">
            <asp:GridView ID="Gridview1" runat="server" ></asp:GridView>
        </asp:Panel>
    </ContentTemplate>
</asp:UpdatePanel>

The Gridview1's datasource should be filled from code-behind (based on the real-hour), for example:

    Dim DT As New System.Data.DataTable
    Dim reader As SqlCeDataReader
    Using myCEConnection As New SqlCeConnection(myCEConnectionString)
        myCEConnection.Open()
        Using myCommand As SqlCeCommand = myCEConnection.CreateCommand()
            myCommand.CommandText = "SELECT ScheduleID FROM Schedule " & _
                                    "WHERE (Hour = '"& Hour(Now) &"')"
            reader = myCommand.ExecuteReader()

            DT.Load(reader)
        End Using
        myCEConnection.Close()
    End Using

    Gridview1.DataSource = DT.DefaultView
    Gridview1.DataBind()

The Gridview1 should be refreshed every 1 hour. I tried the code but get nothing. How can I do that? Thank you in advance.

Answer 1

Did you write this code on Timer's Tick Event ?

Ideally it should be on Timer's Tick event. Your timer doesn't have any TICK Event associated. It should be updated with ontick event (example given below):

<asp:Timer ID="timer" runat="server" ontick="timer_Tick"></asp:Timer>