private void DrillAddForm_Closed(object sender, EventArgs e)
{
drillAddForm = null;
}
private void DrillAddFormToolStripMenuItem1_Click(object sender, EventArgs e)
{
if (drillAddForm == null)
{
drillAddForm = new DrillAddForm(this);
drillAddForm.Closed += new EventHandler(DrillAddForm_Closed);
drillAddForm.Show();
}
}
