C# and WPF tutorial files

WPF/03-TreeViewsSimpleViewModel/WpfTreeView/Directory/Data/DirectoryItem.cs

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+namespace WpfTreeView
+{
+    /// <summary>
+    /// Information about a directory item such as a drive, a file or a folder
+    /// </summary>
+    public class DirectoryItem
+    {
+        /// <summary>
+        /// The type of this item
+        /// </summary>
+        public DirectoryItemType Type { get; set; }
+
+        /// <summary>
+        /// The absolute path to this item
+        /// </summary>
+        public string FullPath { get; set; }
+
+        /// <summary>
+        /// The name of this directory item
+        /// </summary>
+        public string Name { get { return this.Type == DirectoryItemType.Drive ? this.FullPath : DirectoryStructure.GetFileFolderName(this.FullPath); } }
+    }
+}

WPF/03-TreeViewsSimpleViewModel/WpfTreeView/Directory/Data/DirectoryItemType.cs

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+namespace WpfTreeView
+{
+    /// <summary>
+    /// The type of a directory item
+    /// </summary>
+    public enum DirectoryItemType
+    {
+        /// <summary>
+        /// A logical drive
+        /// </summary>
+        Drive,
+        /// <summary>
+        /// A phyiscal file
+        /// </summary>
+        File,
+        /// <summary>
+        /// A folder
+        /// </summary>
+        Folder
+    }
+}