>>Hi,
>>Why? (I mean why do you think that - not why would he want to do it :-})
>
>I think every time I used Attributes.Add method (technique learned here from Paul M) I used it to add client-side code, that's why I assumed the same case with Dmitry.

I think you're right in that the Attributes collection only includes (and only can include) items that are not properties of the control.
But Dimitry was using C# code behind to handle the event so I assumed he wanted server side handling.....