UpdatePanel - update twice in same routine

[vbcode1980]

Hi,

I'm trying to do a number of large queries in the same routine, and have a label in an updatepanel update after each one.

I must be doing something wrong, however, because whenever I fire up the routine, my label won't update until the last query is done.
Isn't it possible to do UpdatePanel.Update multiple times in the same routine/event?
This is the code I'm using:

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
        lblStatus.Text = "Busy with task 1"
        UpdatePanel1.Update()

        LongTask()

        lblStatus.Text = "Busy doing task 2!"
        UpdatePanel1.Update()

        LongTask()

        lblStatus.Text = "Done!"
        UpdatePanel1.Update()
    End Sub

    Private Sub LongTask()
        conn = New SqlConnection(connstring)
        conn.Open()
        cmd = New SqlCommand("Select * from very_large_table", conn)
        cmd.CommandType = CommandType.Text
        reader = cmd.ExecuteReader()
    End Sub

When the form loads, the lblStatus is emtpy.
When I click the button, I see the page loading until it displays 'Done!'.
I don't see the other texts.

This is the page source:

<&#37;@ Page Language="VB" 
        MasterPageFile="~/MyApp.master" 
        AutoEventWireup="false" 
        CodeFile="test_page.aspx.vb" 
        EnableEventValidation="false"
        Inherits="test_page" 
        title="MyApp" 
        Theme="DefaultTheme" 
        %>  
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
            <asp:Label ID="lblStatus" runat="server"></asp:Label>
            <asp:Button ID="Button1" runat="server" Text="Update!" onclick="Button1_Click" />            
        </ContentTemplate>
    </asp:UpdatePanel>        
</asp:Content>

The page has a masterpage that contains the neccesary Scriptmanager.

Can anyone tell me why it's not working?

[gep13]

Hello,

In this case, what you actually need is two updatepanels.

The first, to perform the long running action, and the second one to check on the progress. The long running task would need to write to something like a Session variable, to indicate the progress of the long running task, which the other UpdatePanel can then read.

Although it doesn't explicitly use an UpdatePanel, there is an application example here:

http://devarchive.net/displaying_pro...processes.aspx

Which uses a similar approach.

Gary