using System;

using System.IO;

using System.Security.Cryptography;

namespace Rextester{

    public class Program{

        public static void Main(string[] args){

            // We can change this to allow a higher percentage into group A

            var splitPercentage = 0.5;

            int hash = Guid.NewGuid().GetHashCode();

            Console.WriteLine($"HashCode for ID: {hash}");

​

            // Normalize hash to a value between 0 and 1

            double normalizedValue = Math.Round((hash & Int32.MaxValue) / (double)Int32.MaxValue, 1);

            Console.WriteLine($"Normalised value of HashCode: {normalizedValue}");

​

            // Assign group based on split percentage

            var assignedGroup = normalizedValue < splitPercentage ? "Group A" : "Group B";

            Console.WriteLine($"Assigned Group: {assignedGroup}");

        }

    }

}