Events inside an ASP.NET Ajax Accordion control?

Hi,

I did not get a response in the ASP.NET WebForms forum so I'm hoping someone in this forum can help me resolve this problem.

I'm using an Accordion control in which I drop two DropDownList controls inside one of the Accordion Pane. When I select an item in the first DropDownList control, it is supposed to trigger an event to re-populate the items of the second DropDownList control based on the item selected in the First DropDownList control. I set the onSelectedIndexChanged="doSomeProcess()" of the first DropDwonList control. But whenever I select an item on the first DropDownList control, I get this error message "Error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method."

How do I set events for DropDownList controls inside an Accordion Pane? Is there something I'm missing here?

Thanks,

Hang

Re: Events inside an ASP.NET Ajax Accordion control?

there should be some problem at the server,

please use fiddler and check the request and response whats going

Re: Events inside an ASP.NET Ajax Accordion control?

I'm sorry, I'm new to Visual Studio 2010, can you tell me what 's the fiddler? Also, once I select an item on the first DropDownList control the ViewState is lost (all of the choices in the first DropDownList disappears) I assume a postback does occur but the viewstate is lost and the onSelectedIndexChange procedure is not called for some reason. I put in some Reponse.Write() statement inside the onSelectedIndexChanged procedure and it does not get called at all. I don't know why the onSelecgtedIndexChanged event procedure is not being callled if a postback occurs. Any ideas why this is happening or how to fix it?

Thanks,

Hang

Re: Events inside an ASP.NET Ajax Accordion control?

Hi Mudasir.Khan,

Also, I'm getting the error in Visual Studio 2010 when I'm debugging my application. I haven't deployed my application to a server yet.

Thanks,

Hang

Re: Events inside an ASP.NET Ajax Accordion control?

Refer this

http://damianblog.com/2007/08/13/not-added-through-addhandler/

http://forums.asp.net/t/1055781.aspx