Fórum ➡ DataTable #1's rows that are NOT present in DataTable #2 ♦, C#

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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;
using System.Data;

// aljodav
// http://rextester.com/users/376

namespace Rextester
{
    public class Program
    {
        public static DataTable GetDT1()
        {
            DataTable dt= new DataTable();
            dt.Columns.Add("Code",typeof(string));
            dt.Columns.Add("Name",typeof(string));
            dt.Rows.Add("C30","Ray");
            dt.Rows.Add("C3","Jim");
            dt.Rows.Add("C35","Kim");
            dt.Rows.Add("C1","Smith");
            dt.Rows.Add("C2","Joan");
            dt.Rows.Add("C8","Mae");
            dt.Rows.Add("C39","Ryz");
            dt.Rows.Add("C31","John");
            dt.Rows.Add("C33","Tim");
            dt.Rows.Add("C11","Crau");
            dt.Rows.Add("C9","Leslie");
            return dt;
        }
        public static DataTable GetDT2()
        {
            DataTable dt= new DataTable();
            dt.Columns.Add("Code",typeof(string));
            dt.Columns.Add("Name",typeof(string));
            dt.Columns.Add("Phone",typeof(string));
            dt.Columns.Add("Address",typeof(string));
            dt.Rows.Add("C44","Ytrew","555","Austria");
            dt.Rows.Add("C22","Zejn","666","China");
            dt.Rows.Add("C3","Jim","777","Spain");
            dt.Rows.Add("C1","Smith","111","France");
            dt.Rows.Add("C55","Cramm","888","Russia");
            dt.Rows.Add("C2","Joan","222","Wales");
            dt.Rows.Add("C31","John","333","Australia");
            dt.Rows.Add("C32","Luc","444","Greece");
            return dt;
        }
        
        public static void Main(string[] args)
        {
            DataTable dt1= GetDT1();
            DataTable dt2= GetDT2();
            
            List<string> codes= dt2 // to be used in Where() LINQ statementq
                .AsEnumerable()
                .Select(x=>x.Field<string>("Code"))
                .ToList()
                ;
            codes.Sort(); // for BinarySearch
            
            Console.WriteLine("These are the DT1 rows that are NOT present in DT2:\n\nCode  Name");
            
            dt1
                .AsEnumerable()
                .Where(x=>codes.BinarySearch(x.Field<string>("Code"))<0)
                .Select(x=>new{Code=x.Field<string>("Code"),Name=x.Field<string>("Name")})
                .ToList()
                .ForEach(x=>Console.WriteLine("{0,4}  {1}",x.Code,x.Name))
                ;
            
            Console.WriteLine("\n\nHello, world!");
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,23 sec, cpu time: 0,23 sec, average memory usage: 21 Mb, average nr of threads: 4