code first的外键问题

[ykpiverson]

public class User
    {
        public int Id { set; get; }
        public int Name { set; get; }
        public virtual int AddressId { set; get; }
        public virtual Address Address { set; get; }
    }
    public class Address
    {
        public int Id { set; get; }
        public string City { set; get; }
    }

有上面两个类，通过AddressId和Address来关联与之相关的Address，我想知道外键AddressId形式有什么要求吗？他是怎么关联到Address的id，如果该为Address_Id或UserAddressId或其他形式，还能关联到Address吗？
求大神解疑！