Partial property override

PartialPropertyOverride.cs

class X { }

class Foo {
    public virtual X Y { get; set; }
    public virtual X Z { get; set; }
}

class Bar : Foo {
    public override X Y { set { } }
    public override X Z { get { return null; } }
}

class P {
    static void Main() {
        var b = new Bar();
        b.Y = b.Y;
        b.Z = b.Z;
    }
}