How to concatenate values in to a comma seperated values in c#

I am reading text file where i would like to get values based on condition. Like ,First i will take FREQ where CELLID = 639 and ISMAINBCCH=YES,that i have done now next task is i have to contenate FREQ values in a comma seperated way where CELLID=639 and ISMAINBCCH=NO, so here the output i want is 24,28,67 .How to achieve this one

lines are

ADD GTRX:TRXID=0, TRXNAME="M_RAK_JeerExch_G_1879_18791_A-0", FREQ=81, TRXNO=0, CELLID=639, IDTYPE=BYID, ISMAINBCCH=YES, ISTMPTRX=NO, GTRXGROUPID=2556;
ADD GTRX:TRXID=1, TRXNAME="M_RAK_JeerExch_G_1879_18791_A-1", FREQ=24, TRXNO=1, CELLID=639, IDTYPE=BYID, ISMAINBCCH=NO, ISTMPTRX=NO, GTRXGROUPID=2556;
ADD GTRX:TRXID=5, TRXNAME="M_RAK_JeerExch_G_1879_18791_A-2", FREQ=28, TRXNO=2, CELLID=639, IDTYPE=BYID, ISMAINBCCH=NO, ISTMPTRX=NO, GTRXGROUPID=2556;
ADD GTRX:TRXID=6, TRXNAME="M_RAK_JeerExch_G_1879_18791_A-3", FREQ=67, TRXNO=3, CELLID=639, IDTYPE=BYID, ISMAINBCCH=NO, ISTMPTRX=NO, GTRXGROUPID=2556;


Source: .net

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