Global Class to access Variables

We like to have a global instance of a class and would like to access across the application (in different forms etc)

What a开发者_StackOverflow社区re the different possiblities? (other than static class).

It sounds like you want the Singleton pattern. Depending on your application you want to be careful though. You only get one instance of it, and this can cause unexpected behaviors with multiple threads etc. (there are other drawbacks too, my main point is that you have to look at the downsides of the pattern also).

C# patterns: http://www.dofactory.com/Patterns/Patterns.aspx

singleton.

Or perhaps (singletons are frowned upon) you could do something with an IoC.

This generally hints that you're doing something wrong though.

You could use ASP.NET Application State.

Application state is a data repository available to all classes in an ASP.NET application. Application state is stored in memory on the server and is faster than storing and retrieving information in a database. Unlike session state, which is specific to a single user session, application state applies to all users and sessions. Therefore, application state is a useful place to store small amounts of often-used data that does not change from one user to another.