I had a class that had lots of methods:

public class MyClass {
    public bool checkConditions() {
        return checkCondition1() &&
               checkCondition2() &&
               checkCondition3();
    }

...conditions methods

    public void DoProcess() {
        FirstPartOfProcess();
        SecondPartOfProcess();
        ThirdPartOfProcess();
    }

...process methods
}

I identified two "vital" work areas, and decided to extract those methods to classes of its own:

public class MyClass {
    private readonly MyClassConditions _conditions = new ...;
    private readonly MyClassProcessExecution = new ...;

    public bool checkConditions() {
        return _conditions.checkConditions();
    }

    public void DoProcess() {
        _process.DoProcess();
    }
}

In Java, I'd define MyClassConditions and MyClassProcessExecution as package protected, but I can't do that in C#.

How would you go about doing this in C#?

Setting both classes as inner classes of MyClass?

I have 2 options: I either define them inside MyClass, having everything in the same file, which looks confusing and ugly, or I can define MyClass as a partial class, having one file for MyClass, other for MyClassConditions and other for MyClassProcessExecution.

Defining them as internal?

I don't really like that much of the internal modifier, as I don't find these classes add any value at all for the rest of my program/assembly, and I'd like to hide them if possible. It's not like they're gonna be useful/reusable in any other part of the program.

Keep them as public?

I can't see why, but I've let this option here.

Any other?

Name it!

Thanks