"Usenet User" wrote:

> The task is simple: to display a databound list of checkboxes on a
> page. Each check/uncheck should cause a postback, during which an
> action must be taken based on which checkbox changed its value and the
> value itself.
>
> Oddly enough, I couldn't find a simple solution for the above problem.
> I tried the most obvious: a CheckBoxList. This control exposes only
> one appropriate event, SelectedIndexChanged, where I can iterate
> through *all* items and find out their values. But this won't tell me
> which of the inner checkboxes changed it's value. I would need to
> maintain a separate collection of the last states and figure out the
> difference manually. In addition, corresponding data keys are not
> available.
>
> Another attempted approach: a DataList with a CheckBox within its
> ItemTemplate. Seems better because this would also give me the
> corresponding key for each item. However, I couldn't find how to
> determine when any checkbox changes it's value. (AutoPostBack is set
> to true) Unlike buttons, CheckBox doesn't have CommandName property,
> therefore the ItemCommand event of the DataList doesn't fire and I am
> not sure how else I would catch the checkbox events.
>
> After that I am lost. Does anyone have any other suggestion?
>
> TIA!
>

>Look at this sample using a Repeater:
>http://www.societopia.net/Samples/Repeater_Hierarchy.aspx
>
>and this sample using a datalist:
>http://www.societopia.net/Samples/DataList_Hierarchy.aspx
>
>Both the above samples use a radio button instead of a checkbox but the
>process of handling the events should be the same.
>
>You can also check this example using a DataGrid:
>http://www.societopia.net/Samples/DataGrid_ChildControlsEvents.aspx
>
>And this example using a GridView in ASP.NET 2.0:
>http://www.webswapp.com/codesamples/aspnet20/gridview_multiplerows_selection/default.aspx
>
>The last 2 samples use the checkbox.