UpdatePanel with dynamic controls won't postback

Question

I am using UpdatePanel and loading dynamically the content:

 <asp:UpdatePanel runat="server" ID="updatePanel" UpdateMode="Conditional">
        <ContentTemplate>
            <div id="dashboard-main">
                <div id="dashboard-content">
                    <div class="d-content">
                        <asp:PlaceHolder runat="server" ID="ContentPanel">
                        </asp:PlaceHolder>
                    </div>
                </div>
                <div id="sub-content">
                    <ul id="nav-02">
                        <li class="current">
                            <asp:LinkButton CommandArgument="Stuff" OnClick="LoadMiniDash" runat="server" ID="myStuff">
                    My Stuff</asp:LinkButton></li>....

What I do is once the LinkButton is pressed, I load a control to the ContentTemplate:

protected void LoadMiniDash(object sender, EventArgs e)
        {
            string miniDashName = ((LinkButton)sender).CommandArgument;

            Control control = Page.LoadControl("~/controls/Dashboard" + miniDashName + ".ascx");
            ContentPanel.Controls.Clear();
            ContentPanel.Controls.Add(control);
            updatePanel.Update();
        }

My problem is, that inside this newly loaded control, there is another Button. once clicked, the updatepanel gets emptied and not postback to the control is made. (it does however do a post to the page itself async. but i see the control won't reach its own code once clicked).

what can be the problem?

thanks

The main problem is that you don't use search. There are a lot of questions regarding handling dynamic controls events. Check this question for example: stackoverflow.com/questions/1589454/… — Yuriy Rozhovetskiy

Pilgerstorfer Franz Pilgerstorfer Franz · Accepted Answer · 2011-11-16T08:38:18

I just tried to rewrite your question. When you load your userControl it appears in the updatePanel. When you hit the button in the userControl, your updatePanel gets updated - and your userControl "disappears".

Imo it disappears because you do not reload your userControl. I tried the following snippet:

protected void btnLoadControl_Click(object sender, EventArgs e)
{
    /// save the name of the userControl to load in a SessionVar
    Session["userControl2Load"] = "ucDemo.ascx";
    Control control = LoadControl("ucDemo.ascx");
    phDemo.Controls.Clear();
    phDemo.Controls.Add(control);
    upDemo.Update();
}
/// reload your userControl on every init of the updatePanel
/// when the sessionVar is set
protected void upDemo_Init(object sender, EventArgs e)
{
    if (Session["userControl2Load"] != null)
    {
        string controlName = Session["userControl2Load"].ToString();
        Control control = LoadControl(controlName);
        phDemo.Controls.Clear();
        phDemo.Controls.Add(control);
    }
    Debug.WriteLine("upDemo Init");
}

it worked for me. Let me know if it work for you too. hth

UpdatePanel with dynamic controls won't postback

2 Answers