using System;

public class Program

{

    public static void Main()

    {

        int key = 103670028;

byte[] intBytes = BitConverter.GetBytes(key);

if (BitConverter.IsLittleEndian)

    Array.Reverse(intBytes);

byte[] result = intBytes;

        string base64Guid = Convert.ToBase64String(result);

        Console.WriteLine($"{base64Guid}");

        // now reverse it

        var x = Convert.FromBase64String(base64Guid);

if (BitConverter.IsLittleEndian)

    Array.Reverse(x);

        int newKey = BitConverter.ToInt32(x);

        Console.WriteLine($"{newKey}");

    }

}