public class ManagerBase
    {
        private NoxonEntities _entities = null;

        public NoxonEntities Entities
        {
            get
            {
                if (_entities == null)
                    _entities = new NoxonEntities();

                return _entities;
            }
        }
    }

//Managers uses ManagerBase class as a Base class
MemberManager currentMemberManager = new MemberManager();
currentMemberManager.Save(memberId, username, password, languageId);


//MemberManager class
public Member Save(long memId, string username, string password, int langId)
        {
            using (var Context =   base.Entities)
            {
                var Data = Context.Member.First(c => c.Id == memId);

                Data.Username = username;
                Data.Password = password;
                Data.Language = Context.Language.First(c => c.Id == langId); //Gets the foreign entity

                Context.SaveChanges();

                return Data;
            }
        }

//Member is an EntityFramework Object which was created during EF Model when I added by visual studio
//Filter is the method that returns an EntityFramework Object from EF (and eventually database) with given some arguments
//SomeArguments could be  MemberId = 2
Member modifiedMember = currentMemberManager.Filter(someArguments);
modifiedMember.UserName = "newvalue";
currentMemberManager.Save(modifiedMember);

public Member Save(Member modifiedMember)
            {
                using (var Context =   base.Entities)
                {
                    var Data = Context.Member.First(c => c.Id == modifiedMember.Id);

                    Data.Username = modifiedMember.Username;
                    Data.Password = modifiedMember.Password;
                    Data.Language = Context.Language.First(c => c.Id == modifiedMember.LanguageId); //Gets the foreign entity

                    Context.SaveChanges();

                    return Data;
                }
            }

public class MyMember
{
    public long Id { set; get; }
    public string Username { set; get; }
    public string Password { set; get; }
    public int LanguageId { set; get; }
}

MyMember.Username = "NewValue";
MyMember.LanguageId = 4; //4 as in new value
currentMemberManager.Save(MyMember); //As you can see MyMember is not an EF Entity in here