asp.net readxml using linq sql

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

namespace JoinMoreThanTwoTablesDynamically
{
    class Program
    {
        static void Main(string[] args)
        {
            //Created a List of List of Int for sample purpose.
            //Same as dataTable is available in a dataset.
            List<list><int>> dataset = new List<list><int>> { 
            new List<int>{1,2,5,6},
            new List<int>{1,3,5,6},
            new List<int>{4,5,6},
            new List<int>{1,5}
            };

            //Query for joining first two tables
            var q1 = from d1 in dataset[0]
                     join d2 in dataset[1]
                        on d1 equals d2
                     select d1;

            //Retrieve how many tables are in there in your dataset
            int noOfTables = dataset.Count;

            //If you have more  than two tables
            //Below Code will run for each table from third table in your dataset.
            if (noOfTables > 2)
            {
                for (int i = 2; i < noOfTables; i++)
                {
                    q1 = from newd1 in q1
                         join d3 in dataset[i]
                         on newd1 equals d3
                         select newd1;
                }
            }
            //Display Result of join on Console Window.
            foreach (var item in q1)
            {
                Console.WriteLine(item.ToString());
            }

        }
    }
}