How To Raise Postback Event manually...

Sorry, but that makes very little sense. Postbacks are not initiated on the server side. The controls contain some Java Script which is executed on the client side. When, for example, a button is clicked, a new request with all kinds of parameters is sent to the server.

Between postbacks no instance of your page exists on the server. At each request (including postbacks) a new instance of the page is instantiated, runs through its life cycle and is destroyed once the response to the request has been sent back.

That's why raising postbacks from the server side makes no sense. At the moment this code is executed you are already in the middle of servicing a request. Even worse, even if you could just start another postback, it would surely hit the same code again, resulting in an endless sequence of postbacks.

I have an idea what you are trying to accomplish with this, but it does not work that way. If I'm right, you have some problem with the page life cycle (everybody does at first) and you had this postback idea to update the page whenever that happens, right?