public List <Exercise_DAL.Studenttemp> searchstubyclassid(int classid)
{
DB_tool dbtool = new DB_tool();
return(dbtool.searchstubyclassid(classid));
}
public int Addstu(List <Exercise_DAL.class_student> c_studl, List <Exercise_DAL.StudInfo1> studentl)
{
DB_tool dbtool = new DB_tool();
return(dbtool.Addstudentandclass(c_studl, studentl));
}