C#

private void NT_FormClosed(object sender, FormClosedEventArgs e)
        {
                MessageBox.Show("Do you want to close the program?", "", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question,MessageBoxDefaultButton.Button2);                 {
                    if(DialogResult == DialogResult.Yes)                    
{
                        Save(sender);
                    }
                    if (DialogResult == DialogResult.Cancel)
                    {
                        Break; :doh: 
                    }
                }
            }           

private void WndSearchResults_FormClosing(object sender, FormClosingEventArgs e)
{
    if (bgDatabaseSearcher.IsBusy)
    {
         if (MessageBox.Show(Resources.msgSearchActive_WindowClosing, "Question",
 MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
         {
             e.Cancel = true;
             return;
         }
         else
         {
             bgDatabaseSearcher.CancelAsync();
             while (bgDatabaseSearcher.IsBusy) 
                  Thread.Sleep(500);
         }
    }
}

private void bgDatabaseSearcher_DoWork(object sender, DoWorkEventArgs e)
        {
            VFS virtualFS = new VFS();

            foreach (ListEntry entry in imagesToSearch)
            {
                try
                {
                    virtualFS.OpenConnection(Path.Combine(AppSettingsManager.ImagesDirectory, entry.imageDbPath));
                    foreach (VFSSearchTerm searchTerm in termsToSearch)
                    {
                        virtualFS.SearchVFS(searchTerm, searchOptions, SearchResultProcessor, entry.imageID);
                        if (bgDatabaseSearcher.CancellationPending) /* The control 
doesn't reach this point if a call to CancelAsync() has been made from the form closing event. */
                        {
                            virtualFS.CloseConnection(true);
                            return;
                        }
                    }
                }
                finally
                {
                    virtualFS.CloseConnection(true);
                }
            }
        }