using System;

using System.Collections.Generic;

using System.Linq;

​

namespace ConsoleApplication1

{

    internal class Course

    {

        public int ID { get; set; }

        public string Subject { get; set; }

        public int Rank { get; set; }

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            List<Course> courses = new List<Course>();

            courses.Add(new Course

            {

                ID = 1,

                Subject = "LINQ Tutorials",

                Rank = 5

            });

​

            courses.Add(new Course

            {

                ID = 2,

                Subject = ".NET Threading Tutorials",

                Rank = 4

            });

​

            courses.Add(new Course

            {

                ID = 3,

                Subject = "Learn WPF",

                Rank = 3

            });

​

            var result = from course in courses

                         where course.Rank > 3 && course.Subject.Contains("Threading")

                         select course;

​

            foreach (var course in result)

            {

                Console.WriteLine(course.Subject);

            }

        }

    }

}

​