public static List <List <object> > AlunoBuscarExercicios() { StreamReader arq = new StreamReader("login.txt"); string CPFAluno = arq.ReadLine(); arq.Close(); string CPFProfessor = AlunoDAL.BuscarExercicios(CPFAluno); return(ExercicioDAL.RetornaExercicios(CPFProfessor)); }