public class Program

    {

        static void Main(string[] args)

        {

            Program p = new Program();

            p.Test();

            Console.ReadLine();

        }

        public void Test()

        {

            List<People> initPeopleList = new List<People>();

            People people = new People("Richy",25,"Shanghai");

            initPeopleList.Add(people);

            people = new People("Sherry",25,"Shanghai");

            initPeopleList.Add(people);

            List<People> newPeopleList = new List<People>();

            people = new People("Kim",25,"Shanghai");

            newPeopleList.Add(people);

            if (CompareEntity(initPeopleList, newPeopleList))

            {

                Console.WriteLine("The two entity has some field is not equal.");

            }

            else

            {

                Console.WriteLine("The two entity are the same.");

            }

        }

        public bool CompareEntity(List<People> initPeopleList,List<People> newPeopleList)

        {

            bool DiffFlag = false;

            if (initPeopleList != null && newPeopleList != null)

            {

                List<PropertyInfo> infoList = typeof(People).GetProperties().ToList();

                foreach (var initPeople in initPeopleList)

                {

                    var commonList = newPeopleList.Where(s => (s.Id == initPeople.Id)).FirstOrDefault(); //We assume id is the primary key.

                    if (commonList != null)

                    {

                        foreach (var propertyInfo in infoList)

                        {

                            var initValue = initPeople.GetType().GetProperty(propertyInfo.Name).GetValue(initPeople, null);

                            var newValue = commonList.GetType().GetProperty(propertyInfo.Name).GetValue(commonList, null);

                            if (initValue != null && !initValue.Equals(newValue))

                            {

                                DiffFlag = true;

                                break;

                            }

                        }

                    }

                    else

                    {

                        DiffFlag = true;

                        break;

                    }

                }

            }

            else if((initPeopleList == null || newPeopleList == null) && (initPeopleList!=newPeopleList))

            {

                DiffFlag=true;

            }

            return DiffFlag;

        }

    }

    public class People

    {

        public string EnglishName { get; set; }

        public int Id { get; set; }

        public string Address { get; set; }

        public People(string name, int Id, string address)

        {

            this.EnglishName = name;

            this.Id = Id;

            this.Address = address;

        }

    }