private void btn3Person_Click(object sender, EventArgs e)
{
if (form3 == null || form3.IsDisposed)
{
form3 = new ListPerson();
form3.MdiParent = MainForm.ActiveForm;
form3.Show();
}
else
{
form3.Activate();
}
}
public PersonForm(ListPerson f)
{
InitializeComponent();
//f.BackColor = Color.Yellow;
}