ASP.Net/C# - Calling web service asynchrously

Hi,

I have two gridviews on web page and i am filling it by calling web services asynchrously in the page load using Microsoft Ajax. Filling of both the grid views is independent of each other.

The problem i m facing is : I have to wait until both the web service call complete. What i want that once first web service complete page will render and anther web service will work in background and once its finished its will render the page again automatically. Because second web service returns thousand of records so its taking long time and client dont want to wait for such a long time.

Please any one tell what is the approach i can take or please fwd me some links which help me regarding this.



Thanks,
Akash