How can a non-static class call another non-static class's method?

Question

I have 2 classes both non-static. I need to access a method on one class to return an object for processing. But since both classes is non-static, I cant just call the metho

Answer 1

By passing an instance to the constructor:

class Bar
{
    private Foo foo;

    public Bar(Foo foo)
    { 
        _foo = foo;
    }

    public void MethodCaller()
    {
        _foo.MethodToCall();
    }
}

Usage:

Foo foo = new Foo();
Bar bar = new Bar(foo);
bar.MethodCaller();