I have three classes; Classes A and B both reference class C.

How can I make it so members of class C can be modified when referenced from class A but not modified when referenced from class B?

IE, the following should be possible;

classA myClassA = new classA(); myClassA.myClassC.IssueNumber = 3;

But this should not be possible;

classB myClassB = new classB(); myClassB.myClassC.IssueNumber = 3;

Making classB.classC read-only still allows properties of classC to be altered.

I'm sure this is basic stuff but can't find a simple answer.

Thanks, A