public App()
            : base()
        {
            this.Dispatcher.UnhandledException += OnDispatcherUnhandledException;
        }

        void AppUI_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
        {
            if (e.Exception == null)
            {
                Application.Current.Shutdown();
                return;
            }
            string time = DateTime.Now.ToString("yyyyMMdd HH:mm:ss");
            string message = String.Format("{0}\t{1}{2}", time, Logger.GetErrorMessage(e.Exception), Environment.NewLine);
            string errorMessage = string.Format("An application error occurred. If this error occurs again there seems to be a serious bug in the application, and you better close it.\n\nError:{0}\n\nDo you want to continue?\n(if you click Yes you will continue with your work, if you click No the application will close)", e.Exception.Message);
            //insert code to log exception here
            if (MessageBox.Show(message, "Application User Interface Error", MessageBoxButton.YesNoCancel, MessageBoxImage.Error) == MessageBoxResult.No)
            {
                if (MessageBox.Show("WARNING: The application will close. Any changes will not be saved!\nDo you really want to close it?", "Close the application!", MessageBoxButton.YesNoCancel, MessageBoxImage.Warning) == MessageBoxResult.Yes)
                {
                    Application.Current.Shutdown();
                }
            }
            e.Handled = true;
        }

        /// <summary>
        /// Catch unhandled exceptions not thrown by the main UI thread.
        /// The above AppUI_DispatcherUnhandledException method for DispatcherUnhandledException will only handle exceptions thrown by the main UI thread. 
        /// Unhandled exceptions caught by this method typically terminate the runtime.
        /// </summary>
        void OnDispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
        {
            string errorMessage = string.Format("An application error occurred. If this error occurs again there seems to be a serious bug in the application, and you better close it.\n\nError:{0}\n\nDo you want to continue?\n(if you click Yes you will continue with your work, if you click No the application will close)", e.Exception.Message);
            string time = DateTime.Now.ToString("yyyyMMdd HH:mm:ss");
            string message = String.Format("{0}\t{1}{2}", time, Logger.GetErrorMessage(e.Exception), Environment.NewLine);
            //insert code to log exception here
            if (MessageBox.Show(message, "Application UnhandledException Error", MessageBoxButton.YesNoCancel, MessageBoxImage.Error) == MessageBoxResult.No)
            {
                if (MessageBox.Show("WARNING: The application will close. Any changes will not be saved!\nDo you really want to close it?", "Close the application!", MessageBoxButton.YesNoCancel, MessageBoxImage.Warning) == MessageBoxResult.Yes)
                {
                    Application.Current.Shutdown();
                }
            }
            e.Handled = true;
        }

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SqlServerCe.4.0"/>
      <add name="Microsoft SQL Server Compact Data Provider 4.0"
           invariant="System.Data.SqlServerCe.4.0"
           description=".NET Framework Data Provider for Microsoft SQL Server Compact"
           type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.1, 
             Culture=neutral, 
             PublicKeyToken=89845dcd8080cc91"/>
    </DbProviderFactories>
  </system.data>
  <configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <section name="Astro.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
    </sectionGroup>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <userSettings>
    <Astro.Properties.Settings>
      <setting name="SelectedPage" serializeAs="String">
        <value>0</value>
      </setting>
      <setting name="Lat" serializeAs="String">
        <value>55.751667</value>
      </setting>
      <setting name="Lng" serializeAs="String">
        <value>37.617778</value>
      </setting>
      <setting name="Address" serializeAs="String">
        <value>Москва, Россия</value>
      </setting>
      <setting name="GMT" serializeAs="String">
        <value>27</value>
      </setting>
    </Astro.Properties.Settings>
  </userSettings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
  </entityFramework>
  <connectionStrings>
    <add name="AstroDBEntities" connectionString="metadata=res://*/Model.AstroDBModel.csdl|res://*/Model.AstroDBModel.ssdl|res://*/Model.AstroDBModel.msl;provider=System.Data.SqlServerCe.4.0;provider connection string=&quot;data source=|DataDirectory|\Data\AstroDB.sdf&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
</configuration>