using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] set1 = { 40, 10, 24, 60, 100, 55, 80, 75, 35 };

        int[] set2 = { 120, 110, 150, 160, 100, 155, 180, 175, 135 };

        var results = set1.Where(i => set2.Contains(i));

         foreach (var i in results)

         {

             Console.WriteLine(i);

         }

​

    }

}