here is the mistake
string nicMac = (queryObj.Properties["MACAddress"].Value != null) ? queryObj.Properties["MACAddress"].Value.ToString() : "";
string nicIp = (queryObj.Properties["IPAddress"].Value != null) ? queryObj.Properties["IPAddress"].Value.ToString() : "";
IPAddress, MACAddress, IPSubnet...all returns string array and you are calling ToString() of string array here is a code snippet I used
string\[\] ipaddresses = (string\[\])netCI\["IPAddress"\];
string\[\] subnets = (string\[\])netCI\["IPSubnet"\];
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L %^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2 W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN% R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
----------------------------------------------- 128 bit encrypted signature, crack if you can
