Dynamic content loading in asp.net page

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ASP.NET

Hi,

I have a huge html file with lot's of divs, each consisting of gridviews.

My objective is to load the page first and then render each of the divs and gridviews so that the user need not wait longer to see something.
The options I have is to call webservice methods using javascript once the page is loaded.

But the challenge I am facing is I need to use some variables declared in the page.
I can put everything in session and then try to access it.
Is it a feasible solution? Or what about firing multiple $post methods?

Please suggest which is the best way.