WPF Folder Browser

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Linq.Expressions;

namespace FolderBrowser
{
    public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;


        public ViewModelBase()
        {
          
        }

        protected virtual void OnPropertyChanged(string propName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propName));
        }

        protected void OnPropertyChanged<T>(Expression<Func<T>> propertyExpression)
        {
            if (propertyExpression.Body.NodeType == ExpressionType.MemberAccess)
            {
                var memberExpr = propertyExpression.Body as MemberExpression;
                string propertyName = memberExpr.Member.Name;
                this.OnPropertyChanged(propertyName);
            }
        }

    }
}