public ObservableCollection<CustomerDetails> GetCutomerDetails (int count) { SetCity (); ObservableCollection<CustomerDetails> orderDetails = new ObservableCollection<CustomerDetails>(); for (int i = 10001; i <= count + 10000; i++) { var country = Country [random.Next (5)]; var citycoll = City [country]; var ord = new CustomerDetails() { CustomerID = CustomerID [random.Next (15)], FirstName = FirstNames [random.Next (15)], LastName = LastNames [random.Next (15)], Gender = Genders [random.Next (5)], Country = Country [random.Next (5)], City = citycoll [random.Next (citycoll.Length - 1)], }; orderDetails.Add (ord); } return orderDetails; }