In Repository.cs update the GetCourses method to sort the list of available courses by the teacher's last name and then

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace Treehouse.CodeChallenges
{
    public class Course
    {
        public Course()
        {
            Students = new List<CourseStudent>();
        }

        public int Id { get; set; }
        public int TeacherId { get; set; }
        [Required, StringLength(200)]
        public string Title { get; set; }
        public string Description { get; set; }
        public int Length { get; set; }

        public Teacher Teacher { get; set; }
        public ICollection<CourseStudent> Students { get; set; }
    }
}

using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;

namespace Treehouse.CodeChallenges
{
    public static class Repository
    {
        public static List<Course> GetCourses()In Repository.cs update the GetCourses method to sort the list of available courses by the teacher's last name and then by their first name.
Remember, you can only make a single call to the OrderBy LINQ operator. To sort by additional properties, you can use the ThenBy operator.
        {
            using (var context = new Context())
            {
                return context.Courses.ToList();
                              .Where(c => c.Teacher.LastName == lastName)
                              // list of available courses by the teacher's last name 
                              .OrderBy(c => c.Teacher.LastName)
                              //  and then by their first name  
                              .ThenBy(c => c.Teacher.FirstName)
                              .ToList();
            }
        }

        public static List<Course> GetCoursesByTeacher(string lastName)
        {
            using (var context = new Context())
            {
                return context.Courses
                              .Where(c => c.Teacher.LastName == lastName)
                              .ToList();
            }
        }
    }
}

namespace Treehouse.CodeChallenges
{
    public class Teacher
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
}