using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<int> allowedBPs = new List<int>(){1,3,5};

        List<int> dataBpids = new List<int>(){1,2,3,4,5};

        var dataWithSecurity = dataBpids.Where(r => allowedBPs.Any(bpid => bpid == r));

        foreach(var data in dataWithSecurity)

        {

            Console.WriteLine(data.ToString());

        }

    }

}

​

​