Note: When is a reference a copy?

In C#, often I find it easier to reference objects by a shorthand than to call the exact place I need it from, such as the case of:
    Circle c = circles[i];
    someValue = c.getNumber()
    c.callMethod();
However, what happens when you actually want to copy the obhect entirely, in the same vein as int i = j;?

Before doing this, understand that ^. Object =/= values, they are unique.

All primitive data types copy when using = by default, whereas complex data types such as objects will reference instead. In the case of objects, in order to create an entirely new duplicate object you would call a copy() function (or at the very least something that fulfills the same role) that effectively creates a new object and assigns all of its primitive values to be the same as the object it is copying. The following would print out "objects are different".
    Circle c = circles[i].copy();
    if (c == circles[i])
    {
        Console.WriteLine("objects are the same");
    }
    else
    {
        Console.WriteLine("objects are different");
    }
And for the fun of it, the same in Java:
    String notCSharp = new String(arrayStrings[i]);
    if (notCSharp == arrayStrings[i])
    {
        System.out.print("objects are the same");
    }
    else
    {
        System.out.print("objects are different");
    }
And that's about that.