public class Customer
{
    private int customerId;
    private string firstName;
    private string lastName;
    private decimal creditLimit;
    private string phoneNumber;

    public int CustomerId
    {
        get { return customerId; }
        set { customerId = value; }
    }

    public string FirstName
    {
        get { return firstName; }
        set { firstName = value; }
    }

    public string LastName
    {
        get { return lastName; }
        set { lastName = value; }
    }

    public decimal CreditLimit
    {
        get { return creditLimit; }
        set { creditLimit = value; }
    }

    public string PhoneNumber
    {
        get { return phoneNumber; }
        set { phoneNumber = value; }
    }

    // Returns the customer's full name (example Property: note upper-case method name)
    public string FullName
    {
        get { return string.Concat(FirstName, " ", LastName); }
    }

    // Constructor method
    public Customer(int id, string fName, string lName, decimal credit, string phone)
    {
        CustomerId = id;
        FirstName = fName;
        LastName = lName;
        CreditLimit = credit;
        PhoneNumber = phone;
    }

    // No-args constructor needed for collection
    public Customer() { }
}