C# + MongoDB - ObjectId sem usar DataTypes/Atributos do MongoDB

// 'clean' entity with no mongo attributes
public class MyClass 
{
    public Guid Id { get; set; }
}

// mappings in data layer
BsonClassMap.RegisterClassMap<MyClass>(cm => 
{
    cm.AutoMap();
    cm.MapIdMember(c => c.Id).SetIdGenerator(CombGuidGenerator.Instance);
});