There have been many question on managing EntityContext lifetime,
e.g. Instantiating a context in LINQ to Entities
I\'ve come to the conclusion tha
EntityConnection is documented to be not thread-safe. I think you could pool them, but you cannot use a single, static connection for a Web application, as there will be many threads involved.
If your EF context is Application-wide, consider that user A has made changes (not committed) & user B has committed his changes, all changes will get committed to the database since both user A & B use the same instance
In my project, I did a per WebRequest intance of the EF context - ie. a context object is static from start through end of a web request & all operations in that request work with the same EF context. This has significantly speeded up my processing without the problem mentioned above.
One way to implement this is to use a DI container (I am using Unity) to manage the lifetime of the EF context. The per web request lifetime manager is not given out of the box in Unity, but there are tons of articles out there which show how this can be done.
HTH.