using System;

using System.Collections.Generic;

​

class Program

{

    static void Main()

    {

        List<int> list1 = new List<int> { 1, 2, 3, 4, 5 };

        List<int> list2 = new List<int> { 100, 101, 102 };

        int insertPosition = 2;

        list1.InsertRange(insertPosition, list2);

        foreach (int item in list1)

        {

            Console.Write(item + " ");

        }

    }

}