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

namespace Work2
{
    class Student
    {
        public string name;
        public DateTime birthDate;
        public string course;
        public int grade;

        public Student(string name, DateTime birthDate, string course, int grade)
        {
            this.name = name;
            this.birthDate = birthDate;
            this.course = course;
            this.grade = grade;
        }




    }
}





using System;
using System.Collections;

namespace Work2
{
    class Program
    {
        static ArrayList list = new ArrayList();

        static void Main(string[] args)
        {
            DateTime bd;
            string name, course;
            int grade, choice;

            do
            {
                Console.Write("Name: ");
                name = Console.ReadLine();
                Console.Write("Date of birth: ");
                bd = Convert.ToDateTime(Console.ReadLine());
                Console.Write("Choose course:\t C# Programming...1\t Software Development...2 ");

                if (Console.ReadLine().Equals("1")) course = "C# Programming";
                else course = "Software Development";

                Console.Write("Grade: ");
                grade = Convert.ToInt32(Console.ReadLine());
                Student student = new Student(name, bd, course, grade);
                list.Add(student);

                Console.WriteLine("Add a new student?\tYes...1 \t No...0");

            } while (Convert.ToInt32(Console.ReadLine()) != 0);

            do
            {
                Console.WriteLine("\nSelect an action:\nFind a student...1\nDisplay C# Programming course students...2\nDisplay the list...3\nRemove a student...4\nExit...0");
                choice = Convert.ToInt32(Console.ReadLine());

                switch (choice)
                {
                    case 1:
                        Console.Write("Enter name: ");
                        if (isOnList(Console.ReadLine())) Console.WriteLine("The student is on the list.");
                        else Console.WriteLine("The student is not on the list!");
                        break;
                    case 2:
                        Console.WriteLine("C# Programming course students: ");
                        DisplayCSStudents();
                        break;
                    case 3:
                        DisplayAll();
                        break;
                    case 4:
                        Console.Write("Enter name: ");
                        name = Console.ReadLine();
                        Remove(name);
                        break;
                }

            } while(choice != 0);

        }

        static bool isOnList(string name)
        {
            bool found = false;
            foreach (Student student in list)
            {
                if (student.name.Equals(name))
                {
                    found = true;
                    break;
                }
            }
            return found;
        }

        static void DisplayCSStudents()
        {
            foreach (Student student in list)
            {
                if (student.course.Equals("C# Programming"))
                {
                    Console.WriteLine("Name: " + student.name);
                    Console.WriteLine("Grade: " + student.grade + "\n");
                }
            }
        }

        static void Sort()
        {
            string[] names = new string[list.Count];
            int i = 0;  //index in string array
            int lIndex; //index in list
            Student s;

            foreach (Student student in list)       //copying of names from the arraylist
            {
                names[i] = student.name;
                i++;
            }

            Array.Sort(names);      //sorting of names

            i = 0;

            for (lIndex = 0; lIndex < list.Count; lIndex++ )    //sorting of objects in the arraylist
            {
                s = (Student)list[lIndex];
                while (!s.name.Equals(names[i])) i++;

                s = (Student)list[i];
                list[i] = list[lIndex];
                list[lIndex] = s;
                i = 0;

            }

        }
        static void DisplayAll()
        {
            Sort();
            Console.WriteLine("Students in the list: ");
            foreach (Student student in list)
            {
                Console.WriteLine("Name: " + student.name);
                Console.WriteLine("Date of birth: " + student.birthDate);
                Console.WriteLine("Course: " + student.course);
                Console.WriteLine("Grade: " + student.grade + "\n");
            }

        }

        static void Remove(string name)
        {
            if (!isOnList(name)) Console.WriteLine("The student is not on the list!");
            else
            {
                foreach (Student student in list)
                {
                    if (student.name.Equals(name))
                    {
                        list.Remove(student);
                        break;
                    }
                }
            }
        }
    }
}