How to correctly select a listbox item so a selection change occurs

[Tim]

Hi

I have what I thought was a very simple requirement, and maybe it is.

I have a ListBox that contains a few items, that I add programmatically in Server side code.

As each item is selected I want to dynammically load a use control and present it to the right of the ListBox.

Actually I have all of this working just fine.
Again I am using a server side selection changed event to control the dynamic loading. 

However I would like to set the intial selection to the first item in the listbox.
I have tried to do this after the LB is loaded, and I have set the first item to selected just before adding it to the LB.

In neither case do I get a selection change event so I can load the initial dynamic control.

What am I missing?

Do I just have to write extra code to load this control seperate from the SelectionChanged event I am relying on now?

TIA  

[Bozhidar]

Hi Tim,

If you want to load an initial user control, I would suggest that you do it in the Page_Load server event. If you use the selection changed mechanism for loading the initial user control, you make an unnecessary postback. Try the following:

1. Extract all the code from the RadListBox1_SelectedIndexChanged event handler in a function, and in the handler just call the function. You can pass the index or value to the function, to determine which listbox item was selected

2. In the Page_Load event handler, if the page isn't a postback, call the same method (with argument 0, if you are using index to determine the listbox item)

Hope this is helpful.

Greetings,
Bozhidar
the Telerik team