Convert small script from python/JS to C#

Need a script to work on C# program, here's the full scripts in python and JS Python - " def getInstagramUrlFromMediaId(media_id): alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_' shortened_id = '' while media_id > 0: remainder = media_id % 64 # dual conversion sign gets the right ID for new posts media_id = (media_id - remainder) // 64; # remainder should be casted as an integer to avoid a type error. shortened_id = alphabet[int(remainder)] + shortened_id return '[login to view URL]' + shortened_id + '/' " JS - " function getInstagramUrlFromMediaId(media_id) { var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'; var shortenedId = ''; media_id = [login to view URL](0, [login to view URL]('_')); while (media_id > 0) { var remainder = bigInt(media_id).mod(64); media_id = bigInt(media_id).minus(remainder).divide(64).toString(); shortenedId = [login to view URL](remainder) + shortenedId; } return '[login to view URL]' + shortenedId + '/'; } "