private void automobilToolStripMenuItem_Click(object sender, EventArgs e)
{
if (frmAutomobil == null)
{
frmAutomobil = new FrmAutomobil();
frmAutomobil.MdiParent = this;
frmAutomobil.Show();
frmAutomobil.Closed += frmAutomobil_Closed;
}
else
{
frmAutomobil.Focus();
}
}
void frmAutomobil_Closed(object sender, EventArgs e)
{
frmAutomobil = null;
}