Ordinalator, C# - rextester

Ordinalator

//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;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            DataTable dt=new DataTable();
            dt.Columns.Add("a",typeof(System.Int32));
            dt.Columns.Add("b",typeof(System.Int32));
            dt.Columns.Add("TDS",typeof(System.Int32),"(a*b)*b");
            
            dt.Rows.Add(new object[] {1,2});
            
            DataTable dt_OldColumnOrdinals = new DataTable();
            dt_OldColumnOrdinals.Columns.Add("rn",typeof(System.Int32));
            dt_OldColumnOrdinals.Columns.Add("name",typeof(System.String));
            dt_OldColumnOrdinals.Rows.Add(new object[] {0,"b"});
            dt_OldColumnOrdinals.Rows.Add(new object[] {1,"a"});
                            foreach(DataRow dr_OldColumnOrdinals in dt_OldColumnOrdinals.Rows)
                            {
                                var oldOrdinal = dt.Columns[dr_OldColumnOrdinals["name"].ToString()].Ordinal;
                                dt.Columns[dr_OldColumnOrdinals["name"].ToString()].SetOrdinal(Convert.ToInt32(dr_OldColumnOrdinals["rn"]));
                                dr_OldColumnOrdinals["rn"] = oldOrdinal;
                            }
            string d="";
            foreach(DataRow dr in dt.Rows)
            {
                d+="\n";
                foreach(DataColumn dc in dt.Columns)
                {
                    d+="\t";
                    d+=dr[dc].ToString();
                }
            }
            Console.WriteLine("Hello, world!\n"+d);
        }
    }
}


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