using System;

using System.Collections.Generic;

using System.Linq;

using System.Data;

using System.Data.DataSetExtensions;

public class Program

{

    public static void Main()

    {

        var table = new DataTable();

        table.Columns.Add("Sequence", typeof(int));

        table.Columns.Add("Value", typeof(string));

        table.Rows.Add(1, "One");

        table.Rows.Add(2, "Two");

        table.Rows.Add(3, "Three");

        table.Rows.Add(4, "Four");

        table.Rows.Add(5, "Five");

        table.Rows.Add(6, "Six");

        table.Rows.Add(7, "Seven");

        const string stringSequence = "1,3,2,5,4,7,6";

​

        IEnumerable<int> intSequence = stringSequence.Split(',').Select(item => item[0])

                                                                .Select(c => (int)Char.GetNumericValue(c));

​

        Dictionary<int, int> sequenceToIndex = 

            intSequence.Select((s, i) => new { s, i})

                       .ToDictionary(item => item.s, item => item.i);

​

        IEnumerable<DataRow> sortedRows = 

            table.AsEnumerable()

                 .OrderBy(r => sequenceToIndex[r.Field<int>("Sequence")]);

​

        DataTable sortedDataTable = sortedRows.CopyToDataTable();

        foreach (DataRow row in sortedDataTable.Rows)

        {

            Console.WriteLine(row.Field<string>("Value"));

        }

    }

}