diff --git a/Disp/DemoUtil.cs b/Disp/DemoUtil.cs
index 9d0bb39..4852061 100644
--- a/Disp/DemoUtil.cs
+++ b/Disp/DemoUtil.cs
@@ -1,4 +1,5 @@
 using Hi.Disp;
+using Hi.HiNcKits;
 using Hi.Licenses;
 using Hi.MongoUtils;
 using Hi.Wpf.Disp;
@@ -26,13 +27,11 @@ namespace Sample.Disp
         /// <param name="displayee">The object that implements IDisplayee to be rendered</param>
         public static void RunApplication(string title, IDisplayee displayee)
         {
+            SingleUserApp.AppBegin();
             Application app = new Application();
             app.Exit += (o, e) =>
             {
-                if(MongoServer.IsDefaultInit)
-                    MongoServer.Default.Dispose();
-                DispEngine.FinishDisp();
-                License.LogOutAll();
+                SingleUserApp.AppEnd();
             };
             app.Run(new RenderingWindow()
             {