How to identify a control that fired a event

[Guest]

Hi, I am a beginner on the ASP.NET.

I created some custom controls (Control Library) and used in a WebForm
(ASPX), I found that when a control fired a event in a ASPX, all the other
controls will be execute the Render method. Rendering the unneccessary things
will make the result incorrect and heavy workload.
My question is how can i know whether the events is fired by itself or other
control in the Render method?

LongRunner

 

[Patrice]

The "sender" parameter does this.

Another option would to perhaps trigger this event at some other time when
all is ready ?

Patrice