Prerender(): what is it?

[mickey0]

I'm not sure if you're talking about the page event PreRender or a specific control?

But generally in ASP.NET PreRender is the last event run before actually transmitting the page to the client (well, one of the last, which the coder himself can access) aka the page/controls being actually rendered.
It is often used if having a lot of dynamically created controls, due to the page life-cycle of PageLoad -> Event -> PreRender

yes, the event Prereder() but can you give me an example code of "what it can do" for example for a componenet Calendar? thanks