private void أجهزةالمغسلةToolStripMenuItem_Click(object sender, EventArgs e)
{
if (dvc == null)
{
dvc = new WM_device();
dvc.MdiParent = this;
dvc.FormClosed += new FormClosedEventHandler(dvc_FormClosed);
dvc.Show();
}
else
{
dvc.Activate();
}
}
void dvc_FormClosed(object sender, FormClosedEventArgs e)
{
dvc = null;
//throw new NotImplementedException();
}