diff --git a/src/WPF/GeneralUpdate.Packet/Domain/Enum/AppType.cs b/src/WPF/GeneralUpdate.Packet/Domain/Enum/AppType.cs
deleted file mode 100644
index 7bb7cc0..0000000
--- a/src/WPF/GeneralUpdate.Packet/Domain/Enum/AppType.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-namespace GeneralUpdate.Packet.Domain.Enum
-{
-    public class AppType
-    {
-        /// <summary>
-        /// main program
-        /// </summary>
-        public const int ClientApp = 1;
-
-        /// <summary>
-        /// upgrade program.
-        /// </summary>
-        public const int UpgradeApp = 2;
-    }
-}
\ No newline at end of file
diff --git a/src/WPF/GeneralUpdate.Packet/Modules/HelperModule.cs b/src/WPF/GeneralUpdate.Packet/Modules/HelperModule.cs
index b97008b..d46df82 100644
--- a/src/WPF/GeneralUpdate.Packet/Modules/HelperModule.cs
+++ b/src/WPF/GeneralUpdate.Packet/Modules/HelperModule.cs
@@ -1,10 +1,5 @@
 using GeneralUpdate.Packet.MVVM;
 using GeneralUpdate.Packet.Views;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace GeneralUpdate.Packet.Modules
 {
diff --git a/src/WPF/GeneralUpdate.Packet/ViewModels/MainViewModel.cs b/src/WPF/GeneralUpdate.Packet/ViewModels/MainViewModel.cs
index 3130ece..6192076 100644
--- a/src/WPF/GeneralUpdate.Packet/ViewModels/MainViewModel.cs
+++ b/src/WPF/GeneralUpdate.Packet/ViewModels/MainViewModel.cs
@@ -21,10 +21,7 @@ public IModule CurrentModule
             set => SetProperty(ref _currentModule , value); 
         }
 
-        internal MainViewModel() 
-        {
-            InitModule();
-        }
+        internal MainViewModel() => InitModule();
 
         private void InitModule() 
         {