public static void AddNew(Contact c)
{
if (c.Id != 0)
{
throw new ApplicationException("Customer should not have id assigned yet");
}
int maxID = _contacts.Max(cust => cust.Id);
c.Id = maxID + 1;
_contacts.Add(c);
}
public static void UpdateContact(Contact c)
{
Contact current = _contacts.Where(t => t.Id == c.Id).First();
if (current != null)
{
_contacts.Remove(current);
_contacts.Add(c);
}
else
{
throw new ApplicationException("Customer " + c.Id + " does not exist");
}
}