INotifyPropertyChanged Implementation

PropertyChangedViewModel.cs

public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void NotifyPropertyChanged<T>(Expression<Func<T>> propertyEvaluator)
        {
            var lambda = propertyEvaluator as LambdaExpression;
            var member = lambda.Body as MemberExpression;
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(member.Member.Name));
            }
        }