Class Practice

Student testStudent0 = new Student() { FirstName = "TestName0", Email = "TestEmail0" };

static void ShowStudentInfo(Student student)
{
    Console.WriteLine("=====================");
    Console.WriteLine(student.FirstName);
    Console.WriteLine(student.LastName);
    Console.WriteLine(student.Email);
    Console.WriteLine(student.Address);
    Console.WriteLine(student.PhoneNumber);
    Console.WriteLine("=====================");
}

Student testStudent1 = new Student("TestName1", "TestLastName1");
Student testStudent2 = new Student("TestName2", "TestLastName2", "test2@gmail.com");
Student testStudent3 = new Student("TestName3", "TestLastName3", "test3@gmail.com", "Test3Address");
Student testStudent4 = new Student("TestName4", "TestLastName4", "test4@gmail.com", "Test4Address", 7771234578);

Student[] students = new Student[]
{
    testStudent0,
    testStudent1,
    testStudent2,
    testStudent3,
    testStudent4,
    new Student("FN", "LN")
};

while (true)
{
    Console.Clear();

    Console.WriteLine("Меню");
    Console.WriteLine("1. Показать всех студентов");
    Console.WriteLine("2. Найти студента по имени");
    Console.WriteLine("3. Добавить нового студента");

    switch (Convert.ToInt32(Console.ReadLine()))
    {
        case 1:
            foreach (Student student in students)
            {
                ShowStudentInfo(student);
            }
            break;
        case 2:
            Console.Write("Введите имя студента: ");
            string inputName = Console.ReadLine();

            bool isFound = false;

            foreach (Student student in students)
            {
                if (inputName == student.FirstName)
                {
                    isFound = true;

                    ShowStudentInfo(student);

                    break;
                }
            }

            if (!isFound)
            {
                Console.WriteLine("Такого студента нет");
            }
            break;
        case 3:
            Student newStudent = InputStudent();

            AddStudent(newStudent);
            break;
        default:
            break;
    }

    Console.WriteLine();
    Console.WriteLine("Нажмите любую клавишу");
    Console.ReadKey();
}

Student InputStudent()
{
    Student newStudent = new Student();

    Console.WriteLine("Создание нового студента");

    Console.Write("Введите имя: ");
    newStudent.FirstName = Console.ReadLine();
    Console.Write("Введите фамилию: ");
    newStudent.LastName = Console.ReadLine();
    Console.Write("Введите эл. почту: ");
    newStudent.Email = Console.ReadLine();
    Console.Write("Введите адрес: ");
    newStudent.Address = Console.ReadLine();
    Console.Write("Введите номер телефона: ");
    newStudent.PhoneNumber = Convert.ToInt64(Console.ReadLine());

    return newStudent;
}

void AddStudent(Student newStudent)
{
    Student[] newArray = new Student[students.Length + 1];

    for (int i = 0; i < students.Length; i++)
    {
        newArray[i] = students[i];
    }

    newArray[^1] = newStudent;

    students = newArray;
    //newArray[newArray.Length - 1] = newStudent;
}

class Student
{
    public string FirstName = "Неизвестное имя";
    public string LastName = "Неизвестная фамилия";
    public string Email = "Неизвестная эл. почта";
    public string Address = "Неизвестный адресс";
    public long PhoneNumber;

    public Student()
    {

    }

    public Student(string firstName, string lastName)
    {
        FirstName = firstName;
        LastName = lastName;
    }

    public Student(string firstName, string lastName, string email)
    {
        FirstName = firstName;
        LastName = lastName;
        Email = email;
    }

    public Student(string firstName, string lastName, string email, string address)
    {
        FirstName = firstName;
        LastName = lastName;
        Email = email;
        Address = address;
    }

    public Student(string firstName, string lastName, string email, string address, long phoneNumber)
    {
        FirstName = firstName;
        LastName = lastName;
        Email = email;
        Address = address;
        PhoneNumber = phoneNumber;
    }
}