Triggers functionality

when is the triggers functionality to be used? when isAsyncPostBackTrigger andPostBackTrigger used? what does their arguments mean?

You can use thePostBackTrigger to specify a control inside the UpdatePanel that should do a postback (not a asynchronous postback.)

You use theAsyncPostBackTrigger to define a control and optional event of the control that should do a asynchronous postback and refresh the UpdatePanel. You can for example use theAsyncPostBackTrigger when you have controls outside of the panel and want them to refresh the panel.

Triggers for update panel

I have a web page (aspx) that has on it 2 controls (ascx) - one of the controls has an update panel with functionality for it etc. - I want to trigger the update function from the second control that has a linkbutton on it.

Is this possible?

TIA

Yes. Update panel has Triggers element which can be used as follows

 <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <Triggers> <asp:AsyncPostBackTrigger ControlID="lnkButton" EventName="Click"/> </Triggers> </asp:UpdatePanel>

It would seem so - but if the trigger and the update panel are in different ascx files they can not see each other - even if those ascx files exist as controls on the same aspx page

You can explicitly call Update method of another UpdatePanel like this:

UpdatePanel1.Update() ;

Assumption: LinkButton is in UpdatePanel2 and the above code is written in event handler for LinkButton click event.

Generally, you have this kind of scenario in Master-Detail relationship. There is tutorial onhttp://ajax.asp.net site about this.

Okay I dont think you are looking at what the question says - because this doesnt work - unless you can point me to the specific tutorial I cant find the one you are talking about

here is a simple picture that diagrams what I am trying to do

Page1.aspx has two controls on it - both controls are ascx files (Control1.ascx and Control2.ascx)

Control1.ascx has an image button that when clicked is to trigger the UpdatePanel on Control2.ascx