public Dictionary <int, string> AddCustomer(string name, string surname, string personalCode, string email)
        {
            Dictionary <int, string> response = new Dictionary <int, string>();

            List <Customer> customers;

            using (var context = new OrderManagerDbContext())
            {
                customers = context.Customers.Select(x => x).ToList();
            }

            bool contains = false;

            foreach (var customer in customers)                      //check if collection of customers contains object
            {                                                        //with user typed personal code
                if (customer.PersonalCode.Equals(personalCode))
                {
                    contains = true;
                }
            }

            if (contains)
            {
                Console.WriteLine("Error. Customer with this personal code already exists");
                response.Add(0, "Customer with this personal code already exists");
                return(response);
            }
            else                                                        //if not, create new customer and add to collection
            {
                try
                {
                    var address = new MailAddress(email);

                    var customer = new Customer(name, surname, personalCode, email);
                    context.Customers.Add(customer);
                    context.SaveChanges();

                    response.Add(1, "Customer successfully added");
                    return(response);
                }
                catch (FormatException)
                {
                    Console.WriteLine("Email address is invalid. Try again");
                    response.Add(0, "Email address is invalid");
                    return(response);
                }
                catch (DbUpdateException)
                {
                    Console.WriteLine("Email address is invalid. Try again");
                    response.Add(0, "Error occurred when saving data in database");
                    return(response);
                }
                catch (Exception)
                {
                    response.Add(0, "Error occurred. Try again later");
                    return(response);
                }
            }
        }
        public Dictionary <int, string> AddEmployee(string name, string surname, string personalCode, string email)
        {
            Dictionary <int, string> response = new Dictionary <int, string>();

            bool contains = false;

            foreach (Employee employee in getEmployees())        //check if collection of employees contains object
            {                                                    //with user typed personal code
                if (employee.PersonalCode.Equals(personalCode))
                {
                    contains = true;
                }
            }

            if (contains)
            {
                Console.WriteLine("Error. Employee with this personal code already exists");
                response.Add(0, "Employee with that personal code already exists");
                return(response);
            }
            else                                                //if not, create new employee and add to collection
            {
                try
                {
                    var address = new MailAddress(email);

                    var employee = new Employee(name, surname, personalCode, email);
                    context.Employees.Add(employee);
                    context.SaveChanges();

                    response.Add(1, "Employee successfully added");
                    return(response);
                }
                catch (FormatException)
                {
                    Console.WriteLine("Email address is invalid. Try again");
                    response.Add(0, "Email address is invalid");
                    return(response);
                }
                catch (DbUpdateException)
                {
                    Console.WriteLine("Email address is invalid. Try again");
                    response.Add(0, "Error occurred when saving data in database");
                    return(response);
                }
                catch (Exception)
                {
                    response.Add(0, "Error occurred. Try again later");
                    return(response);
                }
            }
        }