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ASP.NET+Flash FMS Chat Application

Hi, we have build live chat application with Flash/FMS front and ASP.NET/MSSQL backend. All the changes sent via http GET to certain page which updates MSSQL status.

My questions are :

1.What reason to use webservices instead of simple GET requests and Response.Write() ? Why it is easier and in what it is better ?

2.How to prevent from MSSQL to manage users to avoid timing penalties ? To store in application object is not a better option because it's needed to be locked before modified thus some users may fall. In addition it may fall due to AppPool Recycle.

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