I am in the process of testing nHibernate and I want to know if I can do the following.

I have two tables contacts and emails. Theirs a relationship between them. I can create an instance of the contact like so :

Contact newContact = new Contact();
newContact.title = "Mr";
newContact.name = "George";
newContact.surname = "Robinson";

newContact.primaryemailaddress.emailaddress = "Test1111@test.com";
newContact.primaryemailaddress.whenchanged = System.DateTime.Now;
newContact.primaryemailaddress.whencreated = System.DateTime.Now;

newContact.birthdate = DateTime.Now;
newContact.whenchanged = DateTime.Now;
newContact.whencreated = DateTime.Now;

The primaryemailaddress lines 4,5,6 reference the emails table. However when i debug this i get error on those lines 3,4,5 with the old classic 'Object reference not set to an instance of an object. ' Now I know why, its trying to pass values into my properties when the class (emails) for these properties has not been instantiated. It would be really cool if i could create one object and be able to pass values into its child tables as well (all in the same object). I thought this would be a key feature of nhibernate but I'm new and havent got a clue on how to implement the above.

ANy help greatly appreciated.

It's not really clear which lines you mean and what is the exception. Can you post your mappings, classes, the code that's causing the problem and the exception stack trace? This is a lot of information, but it helps finding problems really fast.