Repository Pattern without an ORM

I am using repository pattern in a .NET C# application that does not use an ORM. However the issue I am having is how to fill One-to-many List properties of an entity. e.g. if a customer has a list of orders i.e. if the Customer class has a List property called Orders and my repository has a method called GetCustomerById, then?

This also raises questions for Features like Change Tracking, Deleting etc? So i think the end result is can I do DDD without ORM ?

But right now I am only interested in lazy loading List properties in my domain entities? Any idea?

Nabeel

I am assuming this is a very common issue for anyone not using an ORM in a Domain Driven Design? Any idea?