diff --git a/Audit.csproj b/Audit.csproj
index f465c75..68d9d4d 100644
--- a/Audit.csproj
+++ b/Audit.csproj
@@ -71,7 +71,7 @@
     <TargetZone>LocalIntranet</TargetZone>
   </PropertyGroup>
   <PropertyGroup>
-    <SignManifests>true</SignManifests>
+    <SignManifests>false</SignManifests>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="CommonServiceLocator, Version=2.0.6.0, Culture=neutral, PublicKeyToken=489b6accfaf20ef0, processorArchitecture=MSIL">
diff --git a/AuditData.cs b/AuditData.cs
index c9231d1..694da7a 100644
--- a/AuditData.cs
+++ b/AuditData.cs
@@ -12,12 +12,12 @@ namespace Audit
     {
        public static AuditData Instance = new Lazy<AuditData>(() => new AuditData()).Value;
 
-        private UserAccount useraccount = null;
+        private UserAccount useraccount = new UserAccount();
 
-        public UserAccount UserAccount
+        public UserAccount Useraccount
         {
             get { return useraccount; }
-            set { useraccount = value; RaisePropertyChanged("UserAccount");}
+            set { useraccount = value; RaisePropertyChanged("Useraccount");}
         }
     }
 }
diff --git a/Models/UserAccountProvide.cs b/Models/UserAccountProvide.cs
index d5ffb8c..f986dd4 100644
--- a/Models/UserAccountProvide.cs
+++ b/Models/UserAccountProvide.cs
@@ -8,7 +8,7 @@ namespace Models
 {
     public class UserAccountProvide : IProvider<UserAccount>
     {
-        private TicketEntities db = new TicketEntities();
+        private readonly TicketEntities db = new TicketEntities();
 
         public int Delete(UserAccount t)
         {
diff --git a/Windows/LogWindow.xaml.cs b/Windows/LogWindow.xaml.cs
index 9e86a45..2b0c9a6 100644
--- a/Windows/LogWindow.xaml.cs
+++ b/Windows/LogWindow.xaml.cs
@@ -38,26 +38,26 @@ namespace Audit.Windows
             {
                 if (this.Passwds.Text == "sunlight")
                 {
-                    MessageBox.Show("警告:进入设置模式请您明确操作目的及可能需承担的后果");
+                    MessageBox.Show("警告：进入设置模式请您明确操作目的及可能需承担的后果");
                     Windows.Set_up setup = new Windows.Set_up();
                     setup.Show();//实例化并打开设置窗口
                     this.Close();//关闭当前窗口
                 }
                 else
                 {
-                    MessageBox.Show("ERR.01:拒绝登录");//设置密码错误
+                    MessageBox.Show("ERR.C0011：拒绝登录");//设置密码错误
                 }
             }
             else
             {
                 UserAccountProvide UserAccountProvide = new UserAccountProvide();
                 var user = UserAccountProvide.Select()
-                .FirstOrDefault(item => item.UserCode == AuditData.Instance.UserAccount.UserCode 
-                && item.PassWord == AuditData.Instance.UserAccount.PassWord);
+                .FirstOrDefault(item => item.UserCode == AuditData.Instance.Useraccount.UserCode 
+                && item.PassWord == AuditData.Instance.Useraccount.PassWord);
 
                 if (user == null)
                 {
-                    MessageBox.Show("ERR.00:用户名或密码错误");
+                    MessageBox.Show("ERR.C0000：用户名或密码错误");
                 }
                 else
                 {