using System;

using System.Collections.Generic;

using System.Linq;

/*

​

The example below shows how you can use SelectMany to coalesce collections into a single list

when Select returns a collection

*/

​

public class Program

{

    public static void Main()

    {

        var tt = new List<List<int>>();

        var a = new List<int>{1,2,3};

        var b = new List<int>{4,5,6};

        tt.Add(a);

        tt.Add(b);

        var gg = tt.SelectMany(t => t);

        foreach(var g in gg)

        {

            Console.WriteLine(g);

        }

    }

}