C#

public void GetProcesses()
{
    pThread = new Thread(FillProcessList);
    pThread.Start();
}

private void FillProcessList()
{
    Process[] myProcesses = Process.GetProcesses();

    for (int i = 0; i < myProcesses.Length; i++)
    {
        int pId = myProcesses[i].Id;
        string pName = myProcesses[i].ProcessName;
        string pUser = GetProcessOwner(pId);

        ListViewItem item = new ListViewItem(new string[] { pId.ToString(), pName, pUser, string.Empty, string.Empty });
        item.Tag = myProcesses[i];
        lvProcesses.Items.Add(item);
    }
}

private void TrackProcesses()
{
    if (pThread != null)
        if (!pThread.IsAlive)
        {
            updateTimer.Stop();
            foreach (ListViewItem item in lvProcesses.Items)
            {
                Process p = Process.GetProcessById(((Process)item.Tag).Id);

                item.SubItems[3].Text = (p.WorkingSet64 / 1024.0M).ToString();

                PerformanceCounter counter = new PerformanceCounter();
                counter.CategoryName = "Process";
                counter.CounterName = "% Processor Time";
                counter.InstanceName = p.ProcessName;

                item.SubItems[4].Text = counter.NextValue().ToString();

            }
            updateTimer.Start();
        }
}

public void StopPThread()
{
    if (pThread != null)
        pThread.Abort();
}

private void updateTimer_Tick(object sender, EventArgs e)
{
    TrackProcesses();
}