einmaliges öffnen eines MDI Child

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bool offen = false;
for (int i = 0; i < this.MdiChildren.Length; i++)
{
  if ( typeof(ChildKlasse) == this.MdiChildren[i].GetType())
  offen = true;
}

if (offen == false)
{
  ChildKlasse Test = new ChildKlasse ();
  Test.MdiParent = this;
  Test.Show();
}