using System;

using System.Runtime.Remoting.Metadata.W3cXsd2001;

​

public class Program

{

                // CRC-CCITT (0xFFFF) with poly 0x1021

        // input (hex string) =  "503002080000024400003886030400000000010100"

        // result expected (hex string) = "354E"

public static string CalcCRC16(string strInput) {

    ushort crc = 0xFFFF;

    byte[] data = GetBytesFromHexString(strInput);

    for (int i = 0; i < data.Length; i++) {

        crc ^= (ushort)(data[i] << 8);

        for (int j = 0; j < 8; j++) {

            if ((crc & 0x8000) > 0)

                crc = (ushort)((crc << 1) ^ 0x1021);

            else

                crc <<= 1;

        }

    }

    return crc.ToString("X4");

}

​

public static Byte[] GetBytesFromHexString(string strInput) {

    Byte[] bytArOutput = new Byte[] { };

    if (!string.IsNullOrEmpty(strInput) && strInput.Length % 2 == 0) {

        SoapHexBinary hexBinary = null;

        try {

            hexBinary = SoapHexBinary.Parse(strInput);

            if (hexBinary != null) {

                bytArOutput = hexBinary.Value;

            }

        }

        catch (Exception ex) {

        }

    }

    return bytArOutput;

}

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string result = CalcCRC16("190CC00000171B0B04100021000000A7F600190CC00000030F110140");            

        Console.WriteLine(result);

    }

​

}