Why can private member variable be changed by class instance?

Question

class TestClass
{
    private string _privateString = \"hello\";
    void ChangeData()
    {
        TestClass otherTestClass = new TestClass();
        otherTestCla         


        

Answer 1

This is because C# enforces class-level privacy and not object-level privacy.

Most mainstream languages enforce the same policy, i.e. C#, C++ and Java. I think the reason are:

1) because developers are accustomed to that kind of policy;

2) because object-level privacy would become much too tedious in return of very few advantages.