private void tsbCount_Click(object sender, EventArgs e)
{
CondTotal ct = CondTotal.CreateForm();
ct.MdiParent = this;
ct.Show();
}
public static CondTotal CreateForm()
{
if (_single == null)
{
_single = new CondTotal();
}
else
{
_single.Activate();
}
return(_single);
}
private void this_FormClosed(object sender, FormClosedEventArgs e)
{
_single = null;
}