buggedForm

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Newtonsoft.Json;
using RepClasses;

namespace MainForm
{
    public partial class Form1 : Form
    {
        static public List<Student> students = new List<Student>();
        public Form1()
        {
            InitializeComponent();
        }

        private void AddStudent_Click(object sender, EventArgs e)
        {
            var addWindow = new Form2();
            addWindow.Show();
        }

        private void start_Click(object sender, EventArgs e)
        {
            students.Clear();
            if (File.Exists(@"C:\Users\thisp\Desktop\Tutoring\RepsProg\studentsData.txt"))
            {
                List<Student> list = JsonConvert.DeserializeObject
                    <List<Student>>(File.ReadAllText
                    (@"C:\Users\thisp\Desktop\Tutoring\RepsProg\studentsData.txt"));
                foreach (Student jo in list)
                {
                    students.Add(jo);
                }
            }
            else
                File.Create(@"C:\Users\thisp\Desktop\Tutoring\RepsProg\studentsData.txt");
        }

        private void finish_Click(object sender, EventArgs e)
        {
            List<Student> list = new List<Student>();
            foreach (Student jo in students)
            {
                list.Add(jo);
            }
            string json = JsonConvert.SerializeObject(list, Formatting.Indented);
            File.WriteAllText
                (@"C:\Users\thisp\Desktop\Tutoring\RepsProg\studentsData.txt", json);
        }
    }
}