public void ShowUsers()
    {
        tblUsers.removeAll();
        String[] column={"User ID","First Name","Last Name", "User Type"};
        int n = ReturnedUsers.size();
        if (n <= 0)
        {
            ShowUInfo(new User());
            String[][] row=new String[1][4];
            tblUsers.removeAll();
            DefaultTableModel tmd=new DefaultTableModel(row,column);
            tblUsers.setModel(tmd);
            return;
        }
        String[][] ts = new String[n][4];
        for(int i=0;i<n;i++)
        {
            User u = (User)ReturnedUsers.get(i);
            ts[i][0] = u.UserID;
            ts[i][1] = u.FirstName;
            ts[i][2] = u.LastName;
            ts[i][3] = u.getType();   
        }
        tblUsers.removeAll();
        DefaultTableModel tmd=new DefaultTableModel(ts,column);
        tblUsers.setModel(tmd);

        ShowUInfo((User)ReturnedUsers.get(0));
    }