static void Main(string[] args)
{
Contact.ContactEssence essence = new Contact.ContactEssence();
// Cannot create Contact yet ...
Contact invalidContact = essence.CreateContact();
if (invalidContact == null)
{
Console.WriteLine("Created NULL contact!");
}
// Fill in the rest of the required fields
essence.FirstName = "Dermot";
essence.LastName = "Gubbins";
// Try creating contact again
Contact validContact = essence.CreateContact();
// Add a phone number (optional)
// but not an address.
validContact.PhoneNumber = "(+44) 444 444";
// Display the valid contact.
Console.WriteLine("\nContact Created ...\n");
Console.WriteLine(validContact.ToString());
Console.WriteLine("Press RETURN to end");
Console.ReadLine();
}
// Private constructor can only be accessed by internal classes
private Contact(Contact.ContactEssence xEssence)
{
// Copy required, immutable properties from essence
mFirstName = xEssence.FirstName;
mLastName = xEssence.LastName;
}
