Register / Display List C #

The function of this code is to read the information: Name of the course, 4 grades and the average

The problem: I can not transport the data in a List on Form Cadastrar and display information on Form Exibir .

Forms:

Form Code Menu :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SimuladorFMM
{
    public partial class Menu : Form
    {
        public Menu()
        {
             InitializeComponent();
        }

        private void cadastrarMenu_Click(object sender, EventArgs e)
        {
             Cadastro abrirCadastro = new Cadastro();
             abrirCadastro.ShowDialog();
        }

        private void botaoExibir_Click(object sender, EventArgs e)
        {
           Exibir abrirExibir = new Exibir();
           abrirExibir.ShowDialog();
        }
    }
}

Form Code of Cadastro :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SimuladorFMM
{
    public partial class Cadastro : Form
    {
        public Cadastro()
        {
            InitializeComponent();
        }

        private void finalizar_Click(object sender, EventArgs e)
        {
            List<Disciplina> dados = new List<Disciplina>();
            Disciplina entrada = new Disciplina();
            entrada.nome = nomeCadastro.Text;
            entrada.nota[0] = Convert.ToDouble(nota1.Text);
            entrada.nota[1] = Convert.ToDouble(nota2.Text);
            entrada.nota[2] = Convert.ToDouble(nota3.Text);
            entrada.nota[3] = Convert.ToDouble(nota4.Text);
            entrada.media = (entrada.nota[0] + entrada.nota[1] + entrada.nota[2] + entrada.nota[3]) / 4;
            dados.Add(entrada);
        }
    }
}

Form Code Exibir :

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SimuladorFMM
{
    public partial class Exibir : Form
    {
        int i = 0;
        public Exibir()
        {
            InitializeComponent();
        }

        private void Exibir_Load(object sender, EventArgs e)
        {

        }

        private void proximo_Click(object sender, EventArgs e)
        {
            if (i < dados.Count)
            {
                i++;
                exibirNome.Text = dados[i].nome;
                exibirNota1.Text = dados[i].nota[0].ToString();
                exibirNota2.Text = dados[i].nota[1].ToString();
                exibirNota3.Text = dados[i].nota[2].ToString();
                exibirNota4.Text = dados[i].nota[3].ToString();
                exibirMedia.Text = dados[i].media.ToString();
            }
        }

        private void anterior_Click(object sender, EventArgs e)
        {
            if (i > 0)
            {
                i--;
                exibirNome.Text = dados[i].nome;
                exibirNota1.Text = dados[i].nota[0].ToString();
                exibirNota2.Text = dados[i].nota[1].ToString();
                exibirNota3.Text = dados[i].nota[2].ToString();
                exibirNota4.Text = dados[i].nota[3].ToString();
                exibirMedia.Text = dados[i].media.ToString();
            }
        }
    }
}