private void textBox9_KeyUp(object sender, KeyEventArgs e) { StaticsFunctions.manejarEventos(e, this); if (e.KeyCode == Keys.Enter) { tc = StaticsFunctions.buscarClientesPorTelefono(mandarTelefono()); panel1.Controls.Clear(); agregarClientes(); } if (e.KeyCode == Keys.Back) { if (textBox9.Text.Length == 0) { textBox8.Focus(); } } }