array = {421-000-3110-000-00, 421-000-5110-000-00 , 421-000-3610-000-00}
check if 421-000-3110-000-00 exists
output : true
array = {421-000-3110-000-00, 421-000-5110-000-00 , 421-000-3610-000-00}
check if 421-000-3110-000-00 exists
output : true
You can also use Contains().
arr.Contains(2)
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