Application.DoEvents();
            Renew:
                Application.DoEvents();
                Random r1 = new Random();
                Random r2 = new Random();
                int listbox = r1.Next(1, 5);
                //MessageBox.Show(listbox.ToString());
                switch (listbox)
                {

                    case 1:
                        {
                            if (q1.Items.Count == 25)
                            {
                                goto Renew;
                            }
                            else
                            {
                                q1.Items.Add(r2.Next(1, 100).ToString());
                                System.Threading.Thread.Sleep(100);
                                goto Renew;
                            }
                            break;
                        }
                    case 2:
                        {
                            if (q2.Items.Count == 25)
                            {
                                goto Renew;
                            }
                            else
                            {
                                q2.Items.Add(r2.Next(1, 100).ToString());
                                System.Threading.Thread.Sleep(100);
                                goto Renew;
                            }
                            break;
                        }
                    case 3:
                        {
                            if (q3.Items.Count == 25)
                            {
                                goto Renew;
                            }
                            else
                            {
                                q3.Items.Add(r2.Next(1, 100).ToString());
                                System.Threading.Thread.Sleep(100);
                                goto Renew;
                            }
                            break;
                        }
                    case 4:
                        {
                            if (q4.Items.Count == 25)
                            {
                                goto Renew;
                            }
                            else
                            {
                                q4.Items.Add(r2.Next(1, 100).ToString());
                                System.Threading.Thread.Sleep(100);
                                goto Renew;
                            }
                            break;
                        }