You must instead build an instance of a concrete kid course. You choose the child class based on what sort of database you're speaking to.

Calling strategies in question expressions just isn't supported if the query might be translated into Another domain. For example, you cannot connect with a standard C# method in LINQ to SQL mainly because SQL Server has no context for it.

In multithreaded programs, Guantee that usage of the DLL world wide more info facts is synchronized (thread Safe and sound) to stay away from doable knowledge corruption. To do that, use TLS to offer one of a kind details for every thread.

This section describes the issues and the requirements that you should take into consideration when you build your own personal DLLs.}