public JsonResult Delete(int id)
        {
            var  expenseCategoryInDb = _expenseCategoryRepository.FindById(id);
            bool result = false;
            var  expensesThatHaveThisCategory =
                _expenseRepository.GetAllFromDatabaseEnumerable().Where(e => e.ExpenseCategoryId == id).ToList();

            if (expensesThatHaveThisCategory.Count == 0 && expenseCategoryInDb != null)
            {
                _expenseCategoryRepository.DeleteFromDatabase(expenseCategoryInDb);
                _expenseCategoryRepository.Save();
                result = true;
            }
            else
            {
                return(Json(new { }));
            }

            return(Json(result, JsonRequestBehavior.AllowGet));
        }