I'm having an issue with UpdatePanels (UP). I have a few UP's on my page that are linked via UP Triggers corresponding to different actions between the UP's. I have one UP that plays a video and sets some other information.

I then have another UP with a DataList containing LinkControls. Each LinkControl will update a SQL Query and is wired to the video UP by the "Command" event. I dynamically set the AsyncPostbackTrigger on each LinkControl via the DataList's "OnItemDataBound" event.

The problem is that when I click the LinkControls my video panel does not update. Here is my code to wire the controls:

// Add postback trigger
AsyncPostBackTrigger ap = new AsyncPostBackTrigger();
ap.ControlID = lnkControl.UniqueID;
ap.EventName = "Command";
upFMV.Triggers.Add(ap);

I verify that the triggers are added and even though the button's Command event fires, the video UpdatePanel does not update.

I've manually added the upFMV.Update() call within the LinkControl and that works, but why will it not work when I dynamically bind the trigger?

Did you try without specifying the EventName for AsyncTrigger?

That works fine. Now I'm curious as to why... Was it because I was specifying the wrong Event? If so, how do I find out which event I need to target?

I tried using Click as the event name however it did not work. My LinkButton has a OnCommand event registered so I thought Command was the correct event. Here's my control:

<asp:LinkButton ID="lnkDisplayName" runat="server" CssClass="dispname" 
Text='<%# Eval("DisplayName") %>' CommandArgument='<%# Eval("Id") %>'
ToolTip='<%# Eval("DisplayName") %>' OnCommand="lnkDisplayName_OnCommand" />

Using no event, as Amit suggested, is probably fine.  I can't think of any unintended consequence of allowing all of that LinkButton's postback events to trigger partial postbacks.
 

Hi

Use the RegisterAsyncPostBackControl instead of Triggers.Add:

Refreshing an UpdatePanel Programmatically

The following example shows how to refresh an UpdatePanel control programmatically. In this example, a page registers a control as a trigger by calling the RegisterAsyncPostBackControl(Control) method. The code refreshes the UpdatePanel control programmatically by calling the Update() method.

Run  View

 

Can the asyncpostback be from a GridView update?  When I have that set the whole functionality of the GridView doesn't work - after insert through GridView I want a DetailsView to populate.