using System;

using System.Linq;

using System.Collections.Generic;

public class Student

{

    public int Id { get; set; }

    public string FullName { get; set; }    

    public List<Course> CoursesSuscribed { get; set; }

}

public class Course

{

    public int Id { get; set; }

    public string CourseName { get; set; }

}

public class Program

{

    public static void Main()

    {

        Business business = new Business();     

        List<Course> johnDoeCourses = business.GetCourses(1); /// TODO: Finish implementation in method     

        Console.WriteLine(String.Format("Total courses for 'John Doe': {0}", johnDoeCourses.Count()));      

        List<Student> studentsInMath = business.GetStudents("Math");/// TODO: Finish implementation in method       

        Console.WriteLine(String.Format("Total students in 'Math': {0}", studentsInMath.Count()));

​

    }

}

​

public class Business

{

    private List<Student> dbcontext { get; set; }

    public Business()

    {   

        GenerateData();

    }   

    public List<Course> GetCourses(int studentId)

    { // TODO: FINISH THIS  

        new Exception();

        return new List<Course>();

    }   

    public List<Student> GetStudents(string courseName)

    { // TODO: FINISH THIS  

        return new List<Student>();

    }   

    private void GenerateData()

    {       

        Student student1 = new Student()

        {

            Id = 1,

            FullName = "John Doe",

            CoursesSuscribed =  new List<Course>()

            {

                new Course()

                {

                    Id = 1,

                    CourseName = "Math"                     

                },

                    new Course()

                {

                    Id = 2,

                    CourseName = "English"                      

                },

                    new Course()

                {

                    Id = 3,

                    CourseName = "Literature"                       

                },

            }

        };  

        Student student2 = new Student()

        {

            Id = 2,

            FullName = "Juanito Perez",

            CoursesSuscribed =  new List<Course>()

            {

                new Course()

                {

                    Id = 4,

                    CourseName = "Spanish"                      

                },

                    new Course()

                {

                    Id = 5,

                    CourseName = "Biology"                      

                }       

            }

        };  

        Student student3 = new Student()

        {

            Id = 3,

            FullName = "Perenganita Lopez",

            CoursesSuscribed =  new List<Course>()

            {

                new Course()

                {

                    Id = 1,

                    CourseName = "Math"                     

                },

                    new Course()

                {

                    Id = 6,

                    CourseName = "French"                       

                }       

            }

        };  

        dbcontext = new List<Student>();

        dbcontext.Add(student1);

        dbcontext.Add(student2);

        dbcontext.Add(student3);

    }   

​

}

​

​

​

​

​