Question

I have a page with a UserControl (in which linkbuttons are dynamically created). On the page I have a UpdatePanel. What I need to do is to add a AsynchronPostBackTrigger to the UpdatePanel but pointing from a LinkButton that is inside the UserControl.

(in the .aspx)

 <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
      <Triggers>
     <asp:AsyncPostBackTrigger ControlID="UserControl`s LinkButton" EventName="Click"
     </Triggers>       
 </asp:UpdatePanel>

So whenever i click the LinkButton inside the UserControl, the UpdatePanel on the page will refresh.

Answer 1

In my opinion the best approach would be to provide a custom event in your UserControl which gets raised on LinkButton-Click and can be used as AsyncPostbackTrigger in your page’s UpdatePanel.

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
     <Triggers>
        <asp:AsyncPostBackTrigger ControlID="UserControl1" EventName="LinkClicked" />
    </Triggers>       
</asp:UpdatePanel>

For example in your UserControl:

public delegate void OnLinkClicked(object sender, EventArgs e);
public event OnLinkClicked LinkClicked;

protected void LinkButton_Clicked(Object sender, EventArgs e)
{
    LinkClicked(sender, e);
}

Then in your page:

protected void Page_Init(object sender, EventArgs e)
{
    MyControl1.LinkClicked += LinkClicked;
}

private void LinkClicked(object sender, EventArgs e)
{
    //this is an AsyncPostBack;
}