public JsonResult Consultar()
 {
     var data = new List<CentroEstudio>();
     string conexion = ProvedorHileraConexion.ConstruirHilera("localhost", "sa", "root");
     using (ModeloSagethDocente dc = new ModeloSagethDocente(conexion))
     {
         dc.Database.Connection.Open();
         data = dc.ObtenerCentrosestudio();
         dc.Database.Connection.Close();
     }
     System.GC.Collect();
     return Json(data, JsonRequestBehavior.AllowGet);
 }