private void button2_Click(object sender, EventArgs e)
        {
            HttpClient client = new HttpClient();

            client.BaseAddress = new Uri("http://localhost:4000/");

            client.DefaultRequestHeaders.Accept.Add(
                new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response = client.GetAsync("Alunos/" + textBox1.Text).Result;

            if (response.StatusCode.ToString().Equals("NotFound"))
            {
                MessageBox.Show("Aluno não encontrado.", "Erro", MessageBoxButtons.OK, MessageBoxIcon.Error);
                client.Dispose();
                limparTela();
                return;
            }

            response = client.GetAsync("Disciplina/" + textBox3.Text).Result;

            if (response.StatusCode.ToString().Equals("NotFound"))
            {
                MessageBox.Show("Disciplina não encontrada.", "Erro", MessageBoxButtons.OK, MessageBoxIcon.Error);
                client.Dispose();
                limparTela();
                return;
            }

            response = client.GetAsync("Matricula/" + textBox1.Text + "/" + textBox3.Text).Result;

            if (response.StatusCode.ToString().Equals("NotFound"))
            {
                MessageBox.Show("Matrícula não encontrada.", "Erro", MessageBoxButtons.OK, MessageBoxIcon.Error);
                client.Dispose();
                limparTela();
                return;
            }

            response = client.GetAsync("Resultado/" + textBox1.Text + "/" + textBox3.Text).Result;

            if (!response.StatusCode.ToString().Equals("NotFound"))
            {
                MessageBox.Show("Este resultado já foi cadastrado.", "Erro", MessageBoxButtons.OK, MessageBoxIcon.Error);
                client.Dispose();
                limparTela();
                return;
            }

            client.Dispose();

            for (int i = 0; i < fila.GetQtd(); i++)
            {
                if (fila.Get(i).RA == short.Parse(textBox1.Text) && fila.Get(i).Cod == short.Parse(textBox3.Text))
                {
                    MessageBox.Show("O dado já foi inserido!", "Erro", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    limparTela();
                    return;
                }
            }

            dataGridView1.Rows.Add();
            dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[0].Value = textBox1.Text;
            dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[1].Value = textBox3.Text;
            dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[2].Value = textBox4.Text;
            dataGridView1.Rows[dataGridView1.Rows.Count - 1].Cells[3].Value = textBox2.Text;

            Resultados res = new Resultados(short.Parse(textBox1.Text), int.Parse(textBox3.Text), float.Parse(textBox4.Text), float.Parse(textBox2.Text));

            fila.Enfileirar(res);
            limparTela();
            button2.Enabled = false;
            button1.Enabled = true;
        }