using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("FD00485F205A5C1B4C101E7D8DE3A107".ToOracleGuid());

    }

}

​

​

    public static class OracleTypeHelper

    {

        public static Guid ToOracleGuid(this string raw16String)

        {

            return new Guid(StringToBytes(raw16String));

        }

​

        private static byte[] StringToBytes(string hex)

        {

            if (hex.Length % 2 == 1)

            {

                throw new Exception("The hex string cannot have an odd number of digits");

            }

​

            byte[] arr = new byte[hex.Length >> 1];

            for (int i = 0; i < hex.Length >> 1; ++i)

            {

                arr[i] = (byte)((GetHexValue(hex[i << 1]) << 4) + (GetHexValue(hex[(i << 1) + 1])));

            }

​

            return arr;

        }

​

        private static int GetHexValue(char hex)

        {

            int val = hex;

            return val - (val < 58 ? 48 : (val < 97 ? 55 : 87));

        }

​

        public static string ToOracleString(this Guid self)

        {

            var bytes = self.ToByteArray();

            int len = bytes.Length * 2;

            char[] chars = new char[len];

            int bi = 0;

            int ci = 0;

            while (ci < len)

            {

                byte b = bytes[bi++];

                chars[ci] = GetHexValue(b / 16);

                chars[ci + 1] = GetHexValue(b % 16);

                ci += 2;

            }

​

            return new string(chars, 0, chars.Length);

        }

​

        private static char GetHexValue(int i)

        {

            return i < 10 ? (char)(i + 48) : (char)(i - 10 + 65);

        }

    }