private void CRTotalSalesButton_Click(object sender, EventArgs e)
{
if (totalSales == null)
{
totalSales = new totalsalesform();
totalSales.MdiParent = this;
totalSales.Dock = DockStyle.Fill;
totalSales.Show();
totalSales.FormClosed += TotalSales_FormClosed;
}
else
{
totalSales.Activate();
}
}
private void TotalSales_FormClosed(object sender, FormClosedEventArgs e)
{
totalSales = null;
}