public static void DisplayOptions(IProject0Repository repository) { while (true) { Console.WriteLine("c: To Create A New Customer"); Console.WriteLine("s: To Search A Customer By Name"); Console.WriteLine("h: Display Customer history"); Console.WriteLine("q: To Return Back to the Main Menu"); Console.WriteLine(); string userinput = Console.ReadLine().ToLower(); if (userinput == "c") { Console.WriteLine("Please Enter The Customer First Name\n"); string firstname = Console.ReadLine(); Console.WriteLine("Please Enter The Customer Last Name\n"); string lastname = Console.ReadLine(); try { Project.Library.Customer customer = new Project.Library.Customer(firstname, lastname); repository.AddCustomer(customer); if (repository.AddCustomer(customer)) { Console.WriteLine("Successfully added Customer"); Console.WriteLine("Remember to save to lock in changes."); } } catch (ArgumentException exception) { Console.WriteLine("Could not Create Customer"); Console.WriteLine(exception.Message); } } else if (userinput == "s") { Console.WriteLine(); Console.WriteLine("Enter a First or Last Name you would like to search for.\n"); Console.WriteLine("First Name:"); string searchfirstname = Console.ReadLine(); var customers = repository.SearchCustomer(searchfirstname); Console.WriteLine($"ID:{customers.CustomerID} {customers.FirstName},{customers.LastName}"); } else if (userinput == "h") { Console.WriteLine(); Console.WriteLine("Please enter the id of the customer whose order history you'd like to view.\n"); int customerid; while (true) { string customeridstring = Console.ReadLine(); if (int.TryParse(customeridstring, out customerid)) { break; } Console.WriteLine("Value must be an integer"); } var orders = repository.GetOrderByCustomerId(customerid); var customer = repository.FindCustomerID(customerid); int count = orders.Count; Console.WriteLine($"\nWe found {count} results for you from {customer.FirstName}, {customer.LastName}\n"); if (count > 0) { foreach (var order in orders) { Console.WriteLine($"Order Id:{order.OrderID} -- Customer with Id:{order.CustomerID} took an order from store with Id:{order.StoreID} at {order.OrderTime}\n"); } } ; } else if (userinput == "q") { Console.WriteLine(); Console.WriteLine("Returning to Main Menu\n"); break; } } }