private void CheckActiveChildForm(Form FormControl, string FormExists) { int h = 0; if (MdiChildren.Count() > 0) { for (int i = 0; i < MdiChildren.Count(); i++) { if (MdiChildren.ElementAt(i).Text == FormExists) { h = 1; MessageBox.Show(FormExists + " masih aktif!", "Informasi!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); MdiChildren.ElementAt(i).BringToFront(); } } } if (h == 0) { FormControl.MdiParent = this; FormControl.Show(); } }