void dap_FormClosed(object sender, FormClosedEventArgs e)
{
dap = null;
}
private void checkAllPerformanceInformationToolStripMenuItem_Click(object sender, EventArgs e)
{
if (dap == null)
{
dap = new DeleteAnPerformance();
dap.MdiParent = this;
dap.FormClosed += dap_FormClosed;
dap.Show();
}
else
{
dap.Activate();
}
}