hi.., I am beginner in ASP .NET

I have problem with UpdatePanel :

I have one page with two web user control (ascx) , I put a treeview in first ascx and a textbox in second ascx, I put the textbox in an UpdatePanel, and I want to trigger that UpdatePanel by the treeview , how can I do this? , please help

 thanks....
 

Assuming that the treeview acsx is placed on the ascx with the text box, you could try and expose a public event from the treeview ascx, raise that event when the relevant tree view event is raised, then you should be able to make that a trigger for the update panel..

 I do not have time to try that out at the moment but its worth a shot..

Cheers.

In the user control which has the update panel, you can add the id of the second user control as a trigger target. In this way, any control which is
inside the second user control would act as a trigger target for the update panel in the first user control.

So the code can be something like this: 

 <Triggers>
        <atlas:AsyncPostBackTrigger ControlID="WebUserControl2_1" />
 </Triggers>

Assuming that  "WebUserControl2_1" is the id of the second user control.

For TreeView Specific: If you have populateondemand set to true for the treeview which is acting as a trigger target,
than you might encounter an invalid state exception bug. We are working towards fixing it.

vineetc