EF Serialization Entity

Person.cs

using System.Collections.ObjectModel;
using System.Collections.Generic;

namespace MyTest
{
     public class Person
     {
        public Person()
        {
             Tags = new Collection<Tag>();
        }

        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public ICollection<Tag> Tags { get; set; }
     }

     public class Tag
     {
        public Tag()
        {
            People = new Collection<Person>();
        }

        public int Id { get; set; }
        public string Name { get; set; }
        public ICollection<Person> People { get; set; }
     }
}