Singleton in C# "inaccessible" when not in the same namespace?

Question

I tried to implement a singleton class in the following way (I use VS2008 SP1) :

namespace firstNamespace
{
   class SingletonClass
   {
      private SingletonClass() {}

      public static readonly SingletonClass Instance = new SingletonClass();
   }
}

When I want to access it from a class in a different namespace (it seems that this is the problem, in the same namespace it works) like :

namespace secondNamespace
{
   ...
   firstNamespace.SingletonClass inst = firstNamespace.SingletonClass.Instance;
   ...
}

I get a compiler error:

error CS0122: 'firstNamespace.SingletonClass' is inaccessible due to its protection level

Does somebody have an idea how to solve this?

Many thanks in advance!

Answer 1

You're missing the keyword public from your class definition.

Answer 2

Sounds more like the singleton is in a different assembly. The default modifier for a class is internal and thereby only accessible in the assembly.