using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<Tuple<string, string>> data = new List<Tuple<string, string>>

            {

                new Tuple<string, string>("Name", "xx"),

                new Tuple<string, string>("Age", "25"),

                new Tuple<string, string>("PostalCode", "12345"),

​

                new Tuple<string, string>("aaa", "bb"),

                new Tuple<string, string>("ccc", "dd"),

​

                new Tuple<string, string>("Name", "yy"),

                new Tuple<string, string>("Age", "30"),

                new Tuple<string, string>("PostalCode", "67890"),

​

                new Tuple<string, string>("eee", "ff"),

​

                new Tuple<string, string>("Name", "zz"),

                new Tuple<string, string>("Age", "27"),

                new Tuple<string, string>("PostalCode", "29870"),

​

            };

​

            var result = Enumerable.Range(0, data.Count).Where(i => data[i].Item1 == "Name")

                        .Select(i => data.Skip(i).Take(3).ToList())

                        .ToList();

​

​

            int counter = 1;

            foreach (var list in result)

            {

                Console.WriteLine("List {0} ->",counter);

                foreach (var item in list)

                {

                    Console.WriteLine("Item1:{0}, Item2:{1}",item.Item1,item.Item2);

                }

                counter++;

            }

    }

}