private void bRoofing_Click(object sender, EventArgs e)
{
if (m_Roofing == null)
{
m_Roofing = new RoofingForm();
m_Roofing.Closed += m_Roofing_Closed;
}
m_Roofing.Show();
}
private void m_Roofing_Closed(object sender, EventArgs e)
{
m_Roofing.Dispose();
m_Roofing = null;
}
