Global Vars in C#

I would like to have global variables which can be used across tests in current project.
In the project namespace, I creates a static class with the global vars (along with accessor methods).
But I was not able to use these vars, error seen while running tests stating: class does not contain definition for var.
I am not so familar with C#, but I tried other solution as well: created a struct inside the static class,
which includes the global vars. But in this case, I was not able to access the struct vars.
Value types for some reason cant be accessed the way we expected global vars to ber accessed.
I cant acess value types globally but for some reason I can acess reference types.

Any ideas or workaround on creating global vars - which can be set/get accross different classes/tests in Telerik?

Thanks,
Rakesh