compare two tables for differences

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //string str = "\"'" + "Raj" + "\"'";

            //Console.WriteLine(str);
            //Console.ReadLine();

            CompareTables();

        }

        public static DataTable CompareTables()
        {
            DataTable first;
            DataTable second;
            first = new DataTable("[ProductionTool].[dbo].[Primary_Table]");
            second = new DataTable("[ProductionTool].[dbo].[LOB_Master]");

            //Create Empty Table
            DataTable table = new DataTable("Difference");
            try
            {
                //Must use a Dataset to make use of a DataRelation object
                using (DataSet ds = new DataSet())
                {
                    //Add tables
                    ds.Tables.AddRange(new DataTable[] { first.Copy(), second.Copy() });
                    //Get Columns for DataRelation
                    //DataColumn[] firstcolumns = new DataColumn[ds.Tables[0].Columns.Count];
                    DataColumn[] firstcolumns = new DataColumn[9];
                    firstcolumns[0] = ds.Tables[0].Columns.Add("LICENSTAGER");
                    firstcolumns[1] = ds.Tables[0].Columns.Add("EngineNo");
                    firstcolumns[2] = ds.Tables[0].Columns.Add("HullNo");
                    firstcolumns[3] = ds.Tables[0].Columns.Add("EngineType");
                    firstcolumns[4] = ds.Tables[0].Columns.Add("Owner");
                    firstcolumns[5] = ds.Tables[0].Columns.Add("Yard");
                    firstcolumns[6] = ds.Tables[0].Columns.Add("DesignSpec");
                    firstcolumns[7] = ds.Tables[0].Columns.Add("OrderDate");
                    firstcolumns[8] = ds.Tables[0].Columns.Add("DeliveryDate");


                    //table.Columns.Add(firstcolumns[0], type(System.Int32));

                    for (int i = 0; i < firstcolumns.Length; i++)
                    {

                        first.Columns.Add(firstcolumns[i].ToString());

                    }




                    //table.Columns.Add(firstcolumns);


                    //DataColumn[] secondcolumns = new DataColumn[ds.Tables[1].Columns.Count];
                    DataColumn[] secondcolumns = new DataColumn[9];
                    secondcolumns[0] = ds.Tables[1].Columns.Add("Licensee");
                    secondcolumns[1] = ds.Tables[1].Columns.Add("ENGINENO");
                    secondcolumns[2] = ds.Tables[1].Columns.Add("HULLNO");
                    secondcolumns[3] = ds.Tables[1].Columns.Add("ENGINETYPE");
                    secondcolumns[4] = ds.Tables[1].Columns.Add("OWNER");
                    secondcolumns[5] = ds.Tables[1].Columns.Add("YARD");
                    secondcolumns[6] = ds.Tables[1].Columns.Add("Spec");
                    secondcolumns[7] = ds.Tables[1].Columns.Add("ORDATE");
                    secondcolumns[8] = ds.Tables[1].Columns.Add("DLDATE");


                    for (int i = 0; i < secondcolumns.Length; i++)
                    {

                        second.Columns.Add(secondcolumns[i].ToString());

                    }
                    //Create DataRelation
                    DataRelation r = new DataRelation(string.Empty, firstcolumns, secondcolumns, false);

                    ds.Relations.Add(r);

                    //Create columns for return table
                    for (int i = 0; i < first.Columns.Count; i++)
                    {

                        table.Columns.Add(first.Columns[i].ColumnName, first.Columns[i].DataType);

                    }



                    //If First Row not in Second, Add to return table.
                    table.BeginLoadData();

                    foreach (DataRow parentrow in ds.Tables[0].Rows)
                    {

                        DataRow[] childrows = parentrow.GetChildRows(r);

                        if (childrows == null || childrows.Length == 0)

                            table.LoadDataRow(parentrow.ItemArray, true);

                    }


                    table.EndLoadData();

                }
            }
            catch (Exception ex)
            {
                throw ex;
            }

            return table;
        }
    }
}

for (int i = 0; i < ds.Tables[0].Columns.Count; i++)
                    {
                        table.Columns.Add(ds.Tables[0].Columns[i].ColumnName, ds.Tables[0].Columns[i].DataType);
                    }


//insted of this

for (int i = 0; i < first.Columns.Count; i++)
                   {
                       table.Columns.Add(first.Columns[i].ColumnName, first.Columns[i].DataType);
                   }