using System;

public class Program

{

    public static void Main()

    {

        var hexString = "92";

        // convert hex string to byte array

        var byteArray = HexStringToByteArray(hexString);

        // "decimal" value you're seeing in excel... this is a fancy way to display an array with commas between values.

        Console.WriteLine(string.Join(",", byteArray));

        // xor each value with 149

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

        {

            byteArray[i] = (byte)(byteArray[i] ^ 149);

        }

        // XOR result... this is a fancy way to display an array with commas between values.

        Console.WriteLine(string.Join(",", byteArray));

    }

    // https://stackoverflow.com/questions/311165/how-do-you-convert-byte-array-to-hexadecimal-string-and-vice-versa

    private static byte[] HexStringToByteArray(string hex)

    {

        int NumberChars = hex.Length;

        byte[] bytes = new byte[NumberChars / 2];

        for (int i = 0; i < NumberChars; i += 2)

            bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);

        return bytes;

    }

}