public object Login(string identityCard, string passWord)
{
Teacher teacher = new Teacher();
Student student = new Student();
StudentDAL studentDAL = new StudentDAL();
TeacherDAL teacherDAL = new TeacherDAL();
try
{
student = studentDAL.SelectByProperty(s => s.IdentityCard.Trim() == identityCard.Trim()).FirstOrDefault();
teacher = teacherDAL.SelectByProperty(t => t.IdentityCard.Trim() == identityCard.Trim()).FirstOrDefault();
if (student !=null)
{
if (student.PassWord.Trim() == passWord.Trim())
return student;
else
throw new ViladationException(new RuleViolation("�����ȷ."));
}
else if (teacher!=null)
{
if (teacher.PassWord.Trim() == passWord.Trim())
return teacher;
else
throw new ViladationException(new RuleViolation("�����ȷ."));
}
else
throw new ViladationException(new RuleViolation("�������!"));
}
catch (AccessDataException ac)
{
throw ac;
}
}