// you'll need the following using at the top of the file to get processes:    
    // using System.Diagnostics;         

    listBox1.Items.Clear();  // this is a ListBox
    myProcessList.Clear();   // this is an ArrayList

    // blank or clear other GUI widgets here

    Process[] myProcesses = Process.GetProcesses();
    try
    {
                    foreach (Process proc in myProcesses)
                    {
                        myProcessList.Add(proc);
                        listBox1.Items.Add(proc.ProcessName);
                    }

    }
    catch { } // suppress any errors during process search

    // update form title to show number of processes found (use myProcessList.Count.ToString())
    // maybe update the message in the status bar also...