Merge, C# - rextester

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string JoinedWithComma1 = "8,1,6,3,16,9,14,11,24,17,22,19";
            string JoinedWithComma2 = "2,7,4,5,10,15,12,13,18,23,20,21";

var split1 = JoinedWithComma1.Split(',');
            var split2 = JoinedWithComma2.Split(',');

if (split1.Length != split2.Length)
            {
                // TODO: decide what you want to happen when the two strings
                //       have a different number of "elements".
                throw new Exception("Oops!");
            }
            
            var merged = new List<string>();
            for (int i = 0; i < split1.Length; i += 2)
            {
                if (i + 1 < split1.Length)
                {
                    merged.AddRange(new[] { split1[i], split1[i + 1],
                                            split2[i], split2[i + 1] });
                }
                else
                {
                    merged.AddRange(new[] { split1[i], split2[i] });
                }
            }
            string result = string.Join(",", merged);
            Console.WriteLine(result);
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 1.13 sec, absolute running time: 0.32 sec, cpu time: 0.23 sec, memory peak: 38 Mb, absolute service time: 1,62 sec