server side validation?

Question

I want to know if I apply server side validation on a text box then when the validation event fires (I means in which state of page cycle this validation has been done in server side)

Answer 1

From this page:

Postback event handling: If the request is a postback, control event handlers are called. After that, the Validate method of all validator controls is called, which sets the IsValid property of individual validator controls and of the page.