Do you realize how little information you actually gave us here?

Yes - memory leaks are possible in ASP.net apps. Are you properly disposing of all objects?

Show us some code for accessing your database from the code behind.

How many users are hitting the site "concurrently"??

Quote Originally Posted by aspfun View Post
As I understood, IIS and SQL server will cause app frozen if they are not in correct configuration.
I've never heard of anything like this - but share with us what your configuration is.