"Не удалось найти строку подключения с именем "WEMEntities" в файле конфигурации приложения."

public partial class LogDataBaseView : UserControl
{
    public LogDataBaseView()
    {
        InitializeComponent();
        DGridActivity.ItemsSource = WEMEntities.GetContext().Fields.ToList();

    }
}

App.Config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- 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=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <connectionStrings><add name="WEMEntities" connectionString="metadata=res://*/WEMBase.csdl|res://*/WEMBase.ssdl|res://*/WEMBase.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=DESKTOP-1P5GCDA\SQLEXPRESS;initial catalog=WEM;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" /></connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
</configuration>

Context

public partial class WEMEntities : DbContext { private static WEMEntities _context;

public WEMEntities()
    : base("name=WEMEntities")
{
}

public static WEMEntities GetContext()
{
    if (_context == null)
        _context = new WEMEntities();

    return _context;
}