// Method to modify a specific customer which exists in the crm file
public void ModifyCustomerSubmenu(bool clear = true)
{
if (clear)
{
Console.Clear();
}
Console.WriteLine("### Modify Customer Submenu ###\n");
ModifyCRMValidationInput();
// Return the customer which matches the provided ID to modify and assign to modifiedcustomer object
Customer customer = Crm.GetCustomer(IDtoMofify);
// if the returned customer in the modified customer object is not null, proceed to modify
if (customer != null)
{
// Store old customers ID, title, first and last names into variables
int OldID = customer.ID;
string OldTitle = customer.title, OldFirstName = customer.firstName, OldLastName = customer.lastName;
// Set the customer ID to the highest id value + 1, in case the customer wants to retain his/her ID and only wants
// to modify the fields. We set the ID to this so that the validation doesnt prompt an error that the ID wanting
// to be retained already exists. If the ID is retained, there is still unique ID's in the list
int HighestID = Crm.CustomerList.Max(Customer => Customer.ID) + 1;
customer.ID = HighestID;
// Save the changed ID value in case customer decideds to retain the same ID in the modification menu.
Crm.SaveToFile();
ModifyIDValidationInput();
customer.ID = IDtoMofify;
Console.Write("Title*: ");
title = StringToTitleCase(Console.ReadLine());
customer.title = title;
Console.Write("FirstName*: ");
firstName = StringToTitleCase(Console.ReadLine());
customer.firstName = firstName;
Console.Write("LastName*: ");
lastName = StringToTitleCase(Console.ReadLine());
customer.lastName = lastName;
GenderValidationInput();
customer.gender = Gender;
DOBValidationInput();
customer.DOB = DOB;
Console.Write("\nSuccessfully modified customer '{0} - {1} {2} {3}' to '{4} {5} {6} {7}' within the customers list",
OldID, OldTitle, OldFirstName, OldLastName, IDtoMofify, title, firstName, lastName);
Crm.SaveToFile();
LastMRRCscreen(() => SubMenu("Customer"), () => ModifyCustomerSubmenu());
}
// If the returned customer in the object is null, then the customer does not exist
else
{
Console.Clear();
Console.WriteLine("Customer with an ID of '{0}' does not exist in the Customers List\n", IDtoMofify);
ModifyCustomerSubmenu(false);
LastMRRCscreen(() => SubMenu("Customer"), () => ModifyCustomerSubmenu());
}
}