[WPF] INotifyPropertyChanged

This interface contains PropertyChanged event which will notify client when a property value changes. Normally, this interface should be implemented on all ViewModel in WPF, but to reduce code repetition and maintainability, we will implement a ViewModelBaseClass instead to implement that interface, then let the ViewModel inherit from that base class.

public class ViewModelBase : INotifyPropertyChanged
        protected virtual void SetProperty(ref T member, T val,
            [CallerMemberName] string propertyName = null)
            if (object.Equals(member, val)) return;
            member = val;
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        protected virtual void OnPropertyChanged(string propertyName)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        public event PropertyChangedEventHandler PropertyChanged = delegate { };


private string _name;
        public string Name
            get { return _name; }
                SetProperty(ref _name, value);

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