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I am not a regular with the MVVM pattern and this is basically my first time playing with it. What I used to do ("normal" WPF), was creating my Views with a Business layer and perhaps a datalayer (which usually contains my entities created by a service or the Entity Framework). Now after some toying I created a standard template from MVVM Light and did this: Locator: public class ViewModelLocator { static ViewModelLocator() { ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default); if (ViewModelBase.IsInDesignModeStatic) { SimpleIoc.Default.Register<IUserService, DesignUserService>(); } else { SimpleIoc.Default.Register<IUserService, IUserService>(); } SimpleIoc.Default.Register<LoginViewModel>(); } public LoginViewModel Login { get { return ServiceLocator.Current.GetInstance<LoginViewModel>(); } } } Login ViewModel: public class LoginViewModel : ViewModelBase { private readonly IUserService _userService; public RelayCommand<Object> LoginCommand { get { return new RelayCommand<Object>(Login); } } private string _userName; public String UserName { get { return _userName; } set { if (value == _userName) return; _userName = value; RaisePropertyChanged("UserName"); } } /// <summary> /// Initializes a new instance of the LoginViewModel class. /// </summary> public LoginViewModel(IUserService userService) { _userService = userService; _closing = true; } private void Login(Object passwordBoxObject) { PasswordBox passwordBox = passwordBoxObject as PasswordBox; if (passwordBox ==

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