arrays - Adding more than one manager of a DL -

i trying add second network user manage dl, getting error when trying append new user current one.

$group = get-distributiongroup "dl name" $list = $group.managedby $new = get-user name $list+=$new 

at point want use set-distributiongroup "dl name" -managedby $list, following error:

*method invocation failed because [microsoft.exchange.data.directory.adobjectid] doesn't          contain method named 'op_addition'. @ line:1 char:8 + $list+= <<<< $new     + categoryinfo          : invalidoperation: (op_addition:string) [], runtimeexception     + fullyqualifiederrorid : methodnotfound* 

i've tried setting $list = @(), didn't help.

thanks, jcgee

i managed achieve using add() method:

$group = get-distributiongroup "dl name" $list = $group.managedby $new = get-recipient name $list += $new.identity  set-distributiongroup "dl name" -managedby $list 

if $list.gettype() find of type arraylist. if understanding correct, can't use addition operator (+) on arraylist because it's not native type.