public string Register(String Uemail, String Upassword)
        {
            string judge;
            OxcoderDataContext personDataContext = new OxcoderDataContext();
            Person person = new Person();
            var query = from s in personDataContext.Person
                        where s.Uemail == Uemail
                        select s;

            //返回Student表中的记录数
            var count = query.Count();
            if (count == 0)//如果有重复的
            {

                person.Uemail = Uemail;
                person.Upassword = Upassword;
                personDataContext.Person.InsertOnSubmit(person);
                personDataContext.SubmitChanges();
                judge = "注册成功";

            }
            else
            {
                judge = "该账号已经被注册";
            }

            return judge;
        }
        public string Register(String Eemail, String Epassword)
        {
            string judge;
            OxcoderDataContext enterpriseDataContext = new OxcoderDataContext();
            Enterprise enterprise = new Enterprise();
            var query = from k in enterpriseDataContext.Enterprise
                        where k.Eemail == Eemail
                        select k;

            //返回Student表中的记录数
            var count = query.Count();
            if (count == 0)//如果有重复的
            {
                enterprise.Eemail = Eemail;
                enterprise.Epassword = Epassword;
                enterpriseDataContext.Enterprise.InsertOnSubmit(enterprise);
                enterpriseDataContext.SubmitChanges();
                judge = "注册成功";

            }
            else
            {
                judge = "该账号已经被注册";
            }

            return judge;
        }