Example of a Bindable in .NET 4.5

Bindable.cs

using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace Rs.Os
{
    internal abstract class Bindable : IBindable
    {
        #region Abstract

        protected void OnPropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
        }

        protected void OnPropertyChanging(string propertyName)
        {
            var handler = PropertyChanging;
            if (handler != null) handler(this, new PropertyChangingEventArgs(propertyName));
        }

        protected bool Set<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
        {
            if (EqualityComparer<T>.Default.Equals(field, value)) return false;
            OnPropertyChanging(propertyName);
            field = value;
            OnPropertyChanged(propertyName);
            return true;
        }

        #endregion

        #region Implementation of INotifyPropertyChanged

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion Implementation of INotifyPropertyChanged

        #region Implementation of INotifyPropertyChanging

        public event PropertyChangingEventHandler PropertyChanging;

        #endregion Implementation of INotifyPropertyChanging
    }
}