School club

// School club program

using System;
using System.IO;
using System.Collections.Generic;

class Submission
{
    // -------------------------
    // Subprograms
    // -------------------------
    static void add_student()
    {
        StreamWriter file = new StreamWriter("programming.txt", true);
        Console.WriteLine("Enter your name to sign up for the club:");
        string student = Console.ReadLine();
        file.WriteLine(student);
        file.Close();
        Console.WriteLine($"You have been signed up, {student}");
    }

    static void show_students()
    {
        Console.WriteLine($"Students that signed up for the programming club:");
        List<string> students = new List<string>();
        StreamReader file = new StreamReader("programming.txt");
        string line;
        while ((line = file.ReadLine()) != null)
        {
            students.Add(line.Trim());
        }
        file.Close();
        foreach (string student in students)
        {
            Console.WriteLine(student);
        }
    }

    static void menu()
    {
        Console.WriteLine("1. Sign up");
        Console.WriteLine("2. Show students");
        string choice = "";
        while (choice != "1" && choice != "2")
        {
            Console.WriteLine("Enter choice:");
            choice = Console.ReadLine();
        }
        switch (choice)
        {
            case "1":
                add_student();
                break;
            case "2":
                show_students();
                break;
        }
    }


    // -------------------------
    // Main program
    // -------------------------
    public static void Main(string[] args)
    {
        menu();
    }
}