public ActionResult AgregarAlumnos(AlumnoEN en)
 {
     return(Content(Convert.ToString(_dal.AgregarAlumno(en))));
 }
 public ActionResult Modificar_Alumno(AlumnoEN en)
 {
     return(Content(Convert.ToString(_dal.Modificar_Alumno(en))));
 }
 public ActionResult EliminarAlumnos(AlumnoEN en)
 {
     return(Content(Convert.ToString(_dal.EliminarAlumno(en))));
 }