private void TextBox1TextChanged(object sender, EventArgs e)
        {
            if (fillPrivThread != null)
            {
                fillPrivThread.Abort();
            }

            ListViewDelegates.ClearItems(lvPrivileges);
            ListViewDelegates.ClearGroups(lvPrivileges);

            fillPrivThread = new Thread(DoWork);
            fillPrivThread.Start();
        }