public List <Grado> GetGradosBy(String descripcion, String comision)
        {
            SqlCommand command = new SqlCommand();
            String     query   = "select g.* from " + table + " g where 1 = 1 ";

            query += SqlHelper.AddFilterFullLikeThan("g", "Grado_Descripcion", descripcion, command);
            query += SqlHelper.AddFilterEqualsThan("g", "Grado_Comision", comision, command);
            command.CommandText = query;
            return(FromRowsToGrados(Conexion.GetData(command)));
        }