private void frmPrincipal_Load(object sender, EventArgs e)
        {
            timer.Enabled = true;

            this.Hide();

            frmLogin form = new frmLogin();

            if (form.ShowDialog() == DialogResult.OK)
            {
                Usuario user = (Usuario)form.Tag;

                lblUserLogado.Text = user.Nome;

                this.Show();
            }
            else
            {
                this.Close();
            }
        }
        private void frmPrincipal_Load(object sender, EventArgs e)
        {
            this.Hide();

            frmLogin form = new frmLogin();

            if (form.ShowDialog() != DialogResult.OK)
            {
                this.Close();
            }
            else
            {
                this.Show();

                Usuario user = (Usuario)form.Tag;

                sUser.Text = " | Usuário: " + user.DisplayName;

                tmHora.Enabled = true;

                CarregarListaUsuarios();
                CarregarListaHistorias();
            }
        }