private void conclusion_btn_Click(object sender, EventArgs e)
{
if (conclusionForm == null)
{
conclusionForm = new ConclusionForm();
conclusionForm.FormClosed += ConclusionForm_FormClosed;
}
this.Hide();
conclusionForm.Show();
}
private void ConclusionForm_FormClosed(object sender, FormClosedEventArgs e)
{
conclusionForm.FormClosed -= ConclusionForm_FormClosed;
conclusionForm = null;
}