[RESOLVED] Threads listing and general use

[Otex]

I need to add thread to various things in an application I am working on and I have a bit of difficulty with the architecture and control of the threads.

I will have a few questions, all on threads, lets start simple

I have a main form which needs to spawn a second form when we click a button but I need to still be able to use the parent form.
I have something like.

  private void button4_Click(object sender, EventArgs e)
        {
            Thread threadErrorPanel = new Thread(new ThreadStart(ErrorPanelStart));
            threadErrorPanel.Start();
            
        }
        private void ErrorPanelStart()
        {
            ErrorPanel fm2 = new ErrorPanel();
            fm2.ShowDialog();
         }

It works fine, the two problems are:
a. If I click on the button again it lanches a 3rd form etc..
-- How can I check if a thread is already running ?

b. if I close the Main form the 2nd form is still running
-- How can I make main close all the threads that have been started ?

c. How can I list all the threads launched from my application?
Do I have to create a hashtable and populate it with my threads as I start them ? If so how can I maintain the table when a thread abnormally aborts ?

Thanks