Бюрократия

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication7
{
    class Student
    {
        private int id;
        private string name;
        private string fname;
        private string surname;

        public int Id
        {
            get { return id; }
            set { id = value; }
        }
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        public string Fname
        {
            get { return fname; }
            set { fname = value; }
        }
        public string Surname
        {
            get { return surname; }
            set { surname = value; }
        }
    }

    class Mark
    {
        private int id;
        private int smark;
        private string subj;
        private string date;

        public int Id
        {
            get { return id; }
            set { id = value; }
        }
        public int Smark
        {
            get { return smark; }
            set { smark = value; }
        }
        public string Subj
        {
            get { return subj; }
            set { subj = value; }
        }
        public string Date
        {
            get { return date; }
            set { date = value; }
        }
    }

    class MarkList
    {
        public static Student FoundStudent(Mark[] mark, Student[] student, Mark i)
        {
            for (int p = 0; p < 4; p++)
            {
                if (i.Id == student[p].Id) return student[p];
            }
            return null;
        }
        public static Mark FoundMark(Mark[] mark, Student[] student, Student i)
        {
            for (int p = 0; p < 16; p++)
            {
                if (i.Id==mark[p].Id) return mark[p];
            }
            return null;
        }

        static void Main(string[] args)
        {
            Student[] student = new Student[4];
            Mark[] mark = new Mark[16];
            for (int i = 0; i < 4; i++)
            {
                student[i] = new Student();
            }
            for (int i = 0; i < 16; i++)
            {
                mark[i] = new Mark();
            }

            student[0].Id = 3021;
            student[0].Name = "Анатолий";
            student[0].Fname = "Александрович";
            student[0].Surname = "Вассерман";
            mark[0].Id = student[0].Id;
            mark[0].Smark = 100;
            mark[0].Subj = "Математика";
            mark[0].Date = "10.01.2016";
            mark[1].Id = student[0].Id;
            mark[1].Smark = 100;
            mark[1].Subj = "Физика";
            mark[1].Date = "22.03.2015";
            mark[2].Id = student[0].Id;
            mark[2].Smark = 10;
            mark[2].Subj = "Русский язык";
            mark[2].Date = "04.02.2013";
            mark[3].Id = student[0].Id;
            mark[3].Smark = 2;
            mark[3].Subj = "История Украины";
            mark[3].Date = "08.11.2014";

            student[1].Id = 3022;
            student[1].Name = "Альберт";
            student[1].Fname = "Батькович";
            student[1].Surname = "Энштейн";
            mark[4].Id = student[1].Id;
            mark[4].Smark = 3;
            mark[4].Subj = "Физика";
            mark[4].Date = "16.12.2016";
            mark[5].Id = student[1].Id;
            mark[5].Smark = 1000;
            mark[5].Subj = "Математика";
            mark[5].Date = "22.03.2015";
            mark[6].Id = student[1].Id;
            mark[6].Smark = 4;
            mark[6].Subj = "Русский язык";
            mark[6].Date = "04.02.2013";
            mark[7].Id = student[1].Id;
            mark[7].Smark = 2;
            mark[7].Subj = "История Украины";
            mark[7].Date = "08.11.2014";

            student[2].Id = 3023;
            student[2].Name = "Юрий";
            student[2].Fname = "Михайлович";
            student[2].Surname = "Хованский";
            mark[8].Id = student[2].Id;
            mark[8].Smark = 1000;
            mark[8].Subj = "Русский язык";
            mark[8].Date = "07.09.2015";
            mark[9].Id = student[2].Id;
            mark[9].Smark = 2;
            mark[9].Subj = "Физика";
            mark[9].Date = "16.12.2016";
            mark[10].Id = student[2].Id;
            mark[10].Smark = 1000;
            mark[10].Subj = "Математика";
            mark[10].Date = "22.03.2015";
            mark[11].Id = student[2].Id;
            mark[11].Smark = 1000;
            mark[11].Subj = "История Украины";
            mark[11].Date = "08.11.2014";

            student[3].Id = 3024;
            student[3].Name = "Владимир";
            student[3].Fname = "Владимирович";
            student[3].Surname = "Кличко";
            mark[12].Id = student[3].Id;
            mark[12].Smark = 2;
            mark[12].Subj = "История Украины";
            mark[12].Date = "08.11.2014";
            mark[13].Id = student[3].Id;
            mark[13].Smark = -2;
            mark[13].Subj = "Русский язык";
            mark[13].Date = "07.09.2015";
            mark[14].Id = student[3].Id;
            mark[14].Smark = 3;
            mark[14].Subj = "Физика";
            mark[14].Date = "16.12.2016";
            mark[15].Id = student[3].Id;
            mark[15].Smark = 2;
            mark[15].Subj = "Математика";
            mark[15].Date = "22.03.2015";

            var AllStudent =
                from check in student
                select check;
            var GoodMarks =
                from check in mark
                where check.Smark > 5
                select check;
            var BadMarks =
                from check in mark
                where check.Smark == 2
                select check;
            var StudentAlp =
                from check in student
                orderby check.Surname
                select check;

            foreach (var i in AllStudent)
            {
                Console.WriteLine("\nИмя:"+i.Name+" "+i.Fname+" "+i.Surname);
                for(int p=0; p<16; p++)
                {
                    if (mark[p].Id==i.Id) { Console.WriteLine("Предмет:" + mark[p].Subj + " Оценка:" + mark[p].Smark + " Дата:" + mark[p].Date); }
                }
            }
            Console.WriteLine("\nСдано на отлично:");
            foreach (var i in GoodMarks)
            {
                switch (i.Subj)
                {
                    case "Математика":Console.WriteLine(FoundStudent(mark, student, i).Name + " " + FoundStudent(mark, student, i).Surname + " - математика"); break;
                    case "Русский язык": Console.WriteLine(FoundStudent(mark, student, i).Name + " " + FoundStudent(mark, student, i).Surname + " - русский язык"); break;
                    case "История Украины": Console.WriteLine(FoundStudent(mark, student, i).Name + " " + FoundStudent(mark, student, i).Surname + " - история"); break;
                    case "Физика": Console.WriteLine(FoundStudent(mark, student, i).Name +" "+ FoundStudent(mark, student, i).Surname + " - физика"); break;
                }
            }
            Console.WriteLine("\nЗавалено:");
            foreach (var i in BadMarks)
            {
                switch (i.Subj)
                {
                    case "Математика": Console.WriteLine(FoundStudent(mark, student, i).Name + " " + FoundStudent(mark, student, i).Surname + " - математика"); break;
                    case "Русский язык": Console.WriteLine(FoundStudent(mark, student, i).Name + " " + FoundStudent(mark, student, i).Surname + " - русский язык"); break;
                    case "История Украины": Console.WriteLine(FoundStudent(mark, student, i).Name + " " + FoundStudent(mark, student, i).Surname + " - история"); break;
                    case "Физика": Console.WriteLine(FoundStudent(mark, student, i).Name + " " + FoundStudent(mark, student, i).Surname + " - физика"); break;
                }
            }
            Console.WriteLine("\nСтуденты по алфавиту:");
            foreach (var i in StudentAlp)
            {
                Console.WriteLine(i.Surname + " " + i.Name + " " + i.Fname);
            }
            Console.WriteLine("\nСреднеий балл:");
            foreach (var i in AllStudent)
            {
                var SredMark =
                    (from check in mark
                     where check.Id == i.Id
                     select check.Smark).Average();
                Console.WriteLine(i.Name+" "+i.Surname+" - "+SredMark);
            }
            Console.ReadKey();
        }
    }
}