using System;

using System.Collections.Generic;

using System.Linq;

​

namespace ConsoleApp1

{

    class Program

    {

        static void Main(string[] args)

        {

            List<Person> list = new List<Person> { new Person { Name="a1", Surname="s1" },

            new Person { Name="a2", Surname="s2" },

            new Person { Name="a11", Surname="s11" }};

​

            var q1 = list.AsQueryable();

​

            Console.WriteLine("Hello World!");

            foreach (var item in q1.Where(w=>w.Name.Contains("1")))

            {

                Console.WriteLine($"{item.Name} {item.Surname}");

            }

        }

    }

​

    public class Person

    {

        public string Name { get; set; }

        public string Surname { get; set; }

    }

}

​