Function overloading

C# has a good system for Get and Set Methods

public class PropertyHolder
{
    private int someProperty = 0;

    public int SomeProperty
    {
        get
       {
            return someProperty;
        }
        set
       {
            someProperty = value;
        }
    }
}

Using that system you can also just use the set/get bits of it to signify write or read only variables.