public ActionResult Edit(string id, EditExpenseViewModel model)
 {
     if (ModelState.IsValid)
     {
         var command = new EditExpenseCommand
         {
             ID = id,
             Amount = model.Amount,
             Date = model.Date,
             Shop = model.Shop,
             ExpenseType = model.ExpenseType,
             Owner = model.Owner
         };
         this.invoker.Execute(command);
         return RedirectToAction("Index");
     }
     model.Categories = this.categoryService.GetCategories();
     model.Users = this.userService.GetUsers();
     return View(model);
 }
 //
 // GET: /Expense/Edit/5
 public ActionResult Edit(string id)
 {
     var vm = new EditExpenseViewModel
     {
         Amount = this.expenseService.GetExpense(id).Amount,
         Shop = this.expenseService.GetExpense(id).Shop,
         Date = this.expenseService.GetExpense(id).Date,
         Owner= this.expenseService.GetExpense(id).Owner.Id,
         ExpenseType = this.expenseService.GetExpense(id).ExpenseType.Id,
         Categories = this.categoryService.GetCategories(),
         Users = this.userService.GetUsers()
     };
     return View(vm);
 }