Question

now program show Messagebox and wait user decision.
How make, that program don’t wait?
Show Messagebox, ant keep going.
(I do not need a user action. I just need to show text)

Or maybe a better option than to report the information to a new window?

I hope to understand my problem.

Answer 1

quick and easy way: use a BackgroundWorker to host your long running job and use the worker’s events to pop up messages in the UI thread.

edit: might want to display the messages in the form of a message log.

public partial class MainWindow : Form
{
    #region Constructor
    public MainWindow()
    {
        InitializeComponent();
    }
    #endregion

    #region Events
    private void button_Click(object sender, EventArgs e)
    {
        listBox.Items.Add("Job started!");
        backgroundWorker.RunWorkerAsync();
    }
    private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        for (int i = 0; i < 10; i++)
        {
            // send data from the background thread
            backgroundWorker.ReportProgress(0, i);
        }
    }
    private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        // communicate with UI thread
        listBox.Items.Add(string.Format("Received message: {0}", e.UserState));
    }
    private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        listBox.Items.Add("Job done!");
    }
    #endregion
}