Question

We have C# application that crawling and executing code. But some time system stolp responding becouse code executing too long. How can we stop executing code after 10s that application will not stop responding any more.

Answer 1

The approaches taken to tackle this problem are dependent on the way you’ve designed your long running operation. So, without further details, I can only provide general pointers.

If your code takes to long to execute because you’re not getting a response from a remote system (ie. db, website, etc) in time, then consider timeouts. If the API you use for making those remote calls, doesn’t support timeouts, consider something like the CircuitBreaker pattern:

http://davybrion.com/blog/2009/07/protecting-your-application-from-remote-problems/
http://timross.wordpress.com/2008/02/10/implementing-the-circuit-breaker-pattern-in-c/

If it’s simply that your application is doing a lot of work, make sure you do that work on a thread other than the UI thread, as Twitch said, to keep the UI responsive.

If you’re using a very long loop doing internal work, then it could be worth checking repeatedly in that loop for a cancelation condition being met (this could be a flag set from a different thread or even elapsed time). This approach is called cooperative cancellation.
This article on the .Net 4.0 cancellation framework gives some good background, along with this article which it references.