BL.Permiso.getPermisoID C# (CSharp) Method

        public string getPermisoID(string description)
        {
            try
            {
                var perID = from p in entidad.permisos
                            where p.descripcion == description
                            select p.id;

                return perID.First();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.ToString() + " --Permiso.cs / getPermisoID()");
            }
        }