private void nuevoUsuarioToolStripMenuItem_Click(object sender, EventArgs e)
{
UserForm formularioIngreso = new UserForm(UserForm.ALTA);
formularioIngreso.ShowDialog();
}
private void modificarUsuarioToolStripMenuItem_Click(object sender, EventArgs e)
{
UserForm formularioIngreso = new UserForm(UserForm.MODIFICAR);
formularioIngreso.ShowDialog();
}