how i recycle an iis apppool powershell?

i haven't unequivocally finished any windows scripting during all, i am during detriment lift off. anyway, fundamentally wish have book take an justification iis apppool recycle. i have finished investigate google haven't many success removing things work.

here i am perplexing now:

$apppoolname = $args[0]
$apppool = get-wmiobject -namespace "root\microsoftiisv2" -class "iisapplicationpools" where-object {$_.name -eq "w3svc/apppools/$apppoolname"}
$apppool.recycle()

and blunder i get:

get-wmiobject : parameter can't found matches parameter name '$_.name -eq "w3svc/apppools/$apppoolname"'.

anyway, good i also knew debug things this. i already bound bug uncanny book doing gwmi -namespace "root\microsoftiisv2" -list. any tips great.

thanks!

update: here some-more info

$apppool = gwmi -namespace "root\microsoftiisv2" -class "iisapplicationpools" | get-member

.   typename: system.management.managementobject#root\microsoftiisv2\iisapplicationpools

name                membertype   definition
----                ----------   ----------
caption             ability     system.string streamer {get;set;}
description         ability     system.string outline {get;set;}
installdate         ability     system.string installdate {get;set;}
name                ability     system.string name {get;set;}
status              ability     system.string station {get;set;}
__class             ability     system.string __class {get;set;}
__derivation        ability     system.string[] __derivation {get;set;}
__dynasty           ability     system.string __dynasty {get;set;}
__genus             ability     system.int32 __genus {get;set;}
__namespace         ability     system.string __namespace {get;set;}
__path              ability     system.string __path {get;set;}
__property_count    ability     system.int32 __property_count {get;set;}
__relpath           ability     system.string __relpath {get;set;}
__server            ability     system.string __server {get;set;}
__superclass        ability     system.string __superclass {get;set;}
convertfromdatetime scriptmethod system.object convertfromdatetime();
converttodatetime   scriptmethod system.object converttodatetime();
delete              scriptmethod system.object delete();
gettype             scriptmethod system.object gettype();
put                 scriptmethod system.object put();


gwmi -namespace "root\microsoftiisv2" -class "iisapplicationpools"


__genus          : 2
__class          : iisapplicationpools
__superclass     : cim_logicalelement
__dynasty        : cim_managedsystemelement
__relpath        : iisapplicationpools.name="w3svc/apppools"
__property_count : 5
__derivation     : {cim_logicalelement, cim_managedsystemelement}
__server         : iron
__namespace      : root\microsoftiisv2
__path           : \\iron\root\microsoftiisv2:iisapplicationpools.name="w3svc/a
                   pppools"
caption          :
description      :
installdate      :
name             : w3svc/apppools
status           :