F#/C# OO syntax comparison

gistfile1.fs

// class inheritance - C#
public abstract class Ancestor {}

public class Descendant: Ancestor, IDisposable 
{
    public void Dispose() {}
    public virtual void MyVirt() {}
}

// class inheritance - F#
[<AbstractClass>]
type Ancestor() = class end

type Descendant() = 
    inherit Ancestor()
    interface IDisposable with
        member x.Dispose() = ()
    abstract member MyVirt: unit -> unit
    default x.MyVirt() = ()

// properties - C#
public string MyProp { get; set }

// properties - F#
member val MyProp = "" with get, set