private void button1_Click(object sender, EventArgs e) { try { if ((comboRoles.SelectedItem as dynamic).Value == 0) { throw new Exception("Debe seleccionar un rol"); } Rol rol_mapper = new Rol(); int rol_id = (comboRoles.SelectedItem as dynamic).Value; SingletonUsuario.Instance.rol_actual = rol_mapper.Mapear(rol_id); new FormPrincipal(); Hide(); } catch (Exception exception) { MessageBox.Show(exception.Message, " Rol erroneo", MessageBoxButtons.OK, MessageBoxIcon.Error); } }