Make abstract class only visible to my classes

I have an abstract class and I only want it visible to my classes only. If somebody references the library, I don't want them to be able to inherit from my abstract class.

Code:

---

// Class1.cs

abstract class Class1
{
}

---

Code:

---

// Class2.cs

public class Class2 : Class1
{
}

---

The compile error tells me Class1 is less accessible than Class2.

Making Class1 public works but it makes it visible and (inheritable) by any other class but I only want it to be inherited by the classes I specify. Is this possible or necessary?

Use internal instead of public.

It makes your class only accessible for the project in which it is located.

excuse my previous post, it doesn't address your problem effectively.