0 what do you think of the following links:
http://forums.asp.net/t/1704352.aspx?Connect+to+Database+using+javascript
http://forums.asp.net/p/1660047/4328803.aspx?Re+ado+net+using+jquery+and+ajax
0 The link i've provided has everything you need to understand how to communicate with your server data using AJAX in ASP.NET.
If you read the article, you will notice that it uses all the possible aproaches including WebMethod.
0 Would you show me more specific code by using an ajax call to run a webmethod on the main page of the .net application?
0 Definitely possible:http://www.mikesdotnetting.com/article/104/many-ways-to-communicate-with-your-database-using-jquery-ajax-and-asp-net