calculate crc-32 for a hex string

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C#

i am doing work on Intel hex file.in that i have read only data block of each line. i have done with this. and then convert it into byte array from 32 character string to 16 that contains decimal values.
now i want to calculate check sum through crc-32 calculator.
of decimal or hexadecimal string.
can somebody write function for crc-32 calculation of hex string.