private void estadoCivilToolStripMenuItem_Click(object sender, EventArgs e)
{
if (Application.OpenForms["EstadoCivil"] != null)
{
Application.OpenForms["EstadoCivil"].Activate();
}
else
{
EstadoCivil frm = new EstadoCivil();
frm.MdiParent = this;
frm.Show();
}
}