Observe the changes in a value

ObservableValue

public class ObservableValue<T> : INotifyPropertyChanged
{
    public class MyArgs : PropertyChangedEventArgs
    {
        public MyArgs(string propertyName, T old, T @new)
            : base(propertyName)
        {
            Old = old;
            New = @new;
        }
        public T Old { get; private set; }
        public T New { get; private set; }
    }

    public event PropertyChangedEventHandler PropertyChanged = delegate { };

    private void NotifyValueChanged(T @new, T old)
    {
        var EP = PropertyChanged;
        EP(this, new MyArgs("Value", old, @new));
    }

    public T Value
    {
        get { return _Value; }
        set
        {
            T old = value;
            SetValueSilently(value);
            NotifyValueChanged(value, old);
        }
    }
    T _Value;

    public void SetValueSilently(T value)
    {
        _Value = value;
    }

    public static implicit operator T(ObservableValue<T> observable)
    {
        return observable.Value;
    }
}