private void button1_Click(object sender, EventArgs e)
{
if (N == null)
{
N = new NewItem();
N.FormClosed += new FormClosedEventHandler(N_FormClosed);
N.Show();
}
else
{
N.Activate();
}
}
void N_FormClosed(object sender, FormClosedEventArgs e)
{
N = null;
}