In a web application it would be ok if i declare the context of a entity framework model as static? it would be ok? its not recommended? why? Thanks!
Almost definitely not.
ObjectContexts get bigger and bigger as more Objects are queried / saved.
Also sharing an ObjectContext between threads, as you would be doing, is not recommended, because of the locking issues and undeterministic side-effects you would have to deal with.
I wrote a tip on this topic a while back.