split string, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var cName = "brand:description";
            var brand = cName.Substring(0, cName.IndexOf(':'));
            var marketing = cName.Substring(cName.IndexOf(':') + 1);
            Console.WriteLine(brand);
            Console.WriteLine(marketing);
            
            
            var req = new string[]{"N1","N2","E1","E2"};
            var db = new string[]{"O1","E1","E2","O2"};
            //Your code goes here
            Console.WriteLine("New");
            Console.WriteLine(string.Join(",", req.Except(db).ToArray()));
            Console.WriteLine("Obsolete");
            Console.WriteLine(string.Join(",", db.Except(req).ToArray()));
            Console.WriteLine("Same");
            Console.WriteLine(string.Join(",", req.Intersect(db).ToArray()));
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 14 Mb, average nr of threads: 3