C# and WPF tutorial files

WPF/03-TreeViewsSimpleViewModel/WpfTreeView/Directory/ViewModels/Base/BaseViewModel.cs

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+using PropertyChanged;
+using System.ComponentModel;
+
+namespace WpfTreeView
+{
+    /// <summary>
+    /// A base view model that fires Property Changed events as needed
+    /// </summary>
+    [ImplementPropertyChanged]
+    public class BaseViewModel : INotifyPropertyChanged
+    {
+        /// <summary>
+        /// The event that is fired when any child property changes its value
+        /// </summary>
+        public event PropertyChangedEventHandler PropertyChanged = (sender, e) => { };
+    }
+}

WPF/03-TreeViewsSimpleViewModel/WpfTreeView/Directory/ViewModels/Base/RelayCommand.cs

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+using System;
+using System.Windows.Input;
+
+namespace WpfTreeView
+{
+    /// <summary>
+    /// A basic command that runs an Action
+    /// </summary>
+    public class RelayCommand : ICommand
+    {
+        #region Private Members
+
+        /// <summary>
+        /// The action to run
+        /// </summary>
+        private Action mAction;
+
+        #endregion
+
+        #region Public Events
+
+        /// <summary>
+        /// The event thats fired when the <see cref="CanExecute(object)"/> value has changed
+        /// </summary>
+        public event EventHandler CanExecuteChanged = (sender, e) => { };
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Default constructor
+        /// </summary>
+        public RelayCommand(Action action)
+        {
+            mAction = action;
+        }
+
+        #endregion
+
+        #region Command Methods
+
+        /// <summary>
+        /// A relay command can always execute
+        /// </summary>
+        /// <param name="parameter"></param>
+        /// <returns></returns>
+        public bool CanExecute(object parameter)
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Executes the commands Action
+        /// </summary>
+        /// <param name="parameter"></param>
+        public void Execute(object parameter)
+        {
+            mAction();
+        }
+
+        #endregion
+    }
+}