private void button1_Click(object sender, RoutedEventArgs e)
        {
            Na = NetworkAdress(ip2, mask2);
            if (BinToDec(Na.Substring(0, 8)) + "." + BinToDec(Na.Substring(8, 8)) + "." + BinToDec(Na.Substring(16, 8)) + "." + BinToDec(Na.Substring(24, 8)) == textBox.Text)
            {
                MessageBox.Show("Верно!");
                textBox.Text  = "";
                right.Content = Convert.ToString(Convert.ToInt32(right.Content) + 1);
                task.Content  = Convert.ToString(Convert.ToInt32(task.Content) + 1);
                nomer         = nomer + 1;
                ip2           = "";
                Random random = new Random();
                for (x = 0; x < 32; x = x + 1)
                {
                    ip2 = ip2 + Convert.ToString(random.Next(0, 2));//Генерируем айпишник в двоичной системе счисления.
                }
                ip.Content = BinToDec(ip2.Substring(0, 8)) + "." + BinToDec(ip2.Substring(8, 8)) + "." + BinToDec(ip2.Substring(16, 8)) + "." + BinToDec(ip2.Substring(24, 8));



                //генерируем маску подсети.
                a = random.Next(1, 32);

                switch (Convert.ToString(a))
                {
                case "1":
                    mask2  = "10000000000000000000000000000000";
                    mask10 = "128.0.0.0";
                    break;

                case "2":
                    mask2  = "11000000000000000000000000000000";
                    mask10 = "192.0.0.0";
                    break;

                case "3":
                    mask2  = "11100000000000000000000000000000";
                    mask10 = "224.0.0.0";
                    break;

                case "4":
                    mask2  = "11110000000000000000000000000000";
                    mask10 = "240.0.0.0";
                    break;

                case "5":
                    mask2  = "11111000000000000000000000000000";
                    mask10 = "248.0.0.0";
                    break;

                case "6":
                    mask2  = "11111100000000000000000000000000";
                    mask10 = "252.0.0.0";
                    break;

                case "7":
                    mask2  = "11111110000000000000000000000000";
                    mask10 = "254.0.0.0";
                    break;

                case "8":
                    mask2  = "11111111000000000000000000000000";
                    mask10 = "255.0.0.0";
                    break;

                case "9":
                    mask2  = "11111111100000000000000000000000";
                    mask10 = "255.128.0.0";
                    break;

                case "10":
                    mask2  = "11111111110000000000000000000000";
                    mask10 = "255.192.0.0";
                    break;

                case "11":
                    mask2  = "11111111111000000000000000000000";
                    mask10 = "255.224.0.0";
                    break;

                case "12":
                    mask2  = "11111111111100000000000000000000";
                    mask10 = "255.240.0.0";
                    break;

                case "13":
                    mask2  = "11111111111110000000000000000000";
                    mask10 = "255.248.0.0";
                    break;

                case "14":
                    mask2  = "11111111111111000000000000000000";
                    mask10 = "255.252.0.0";
                    break;

                case "15":
                    mask2  = "11111111111111100000000000000000";
                    mask10 = "255.254.0.0";
                    break;

                case "16":
                    mask2  = "11111111111111110000000000000000";
                    mask10 = "255.255.0.0";
                    break;

                case "17":
                    mask2  = "11111111111111111000000000000000";
                    mask10 = "255.255.128.0";
                    break;

                case "18":
                    mask2  = "11111111111111111100000000000000";
                    mask10 = "255.255.192.0";
                    break;

                case "19":
                    mask2  = "11111111111111111110000000000000";
                    mask10 = "255.255.224.0";
                    break;

                case "20":
                    mask2  = "11111111111111111111000000000000";
                    mask10 = "255.255.240.0";
                    break;

                case "21":
                    mask2  = "11111111111111111111100000000000";
                    mask10 = "255.255.248.0";
                    break;

                case "22":
                    mask2  = "11111111111111111111110000000000";
                    mask10 = "255.255.252.0";
                    break;

                case "23":
                    mask2  = "11111111111111111111111000000000";
                    mask10 = "255.255.254.0";
                    break;

                case "24":
                    mask2  = "11111111111111111111111100000000";
                    mask10 = "255.255.255.0";
                    break;

                case "25":
                    mask2  = "11111111111111111111111110000000";
                    mask10 = "255.255.255.128";
                    break;

                case "26":
                    mask2  = "11111111111111111111111111000000";
                    mask10 = "255.255.255.192";
                    break;

                case "27":
                    mask2  = "11111111111111111111111111100000";
                    mask10 = "255.255.255.224";
                    break;

                case "28":
                    mask2  = "11111111111111111111111111110000";
                    mask10 = "255.255.255.240";
                    break;

                case "29":
                    mask2  = "11111111111111111111111111111000";
                    mask10 = "255.255.255.248";
                    break;

                case "30":
                    mask2  = "11111111111111111111111111111100";
                    mask10 = "255.255.255.252";
                    break;

                case "31":
                    mask2  = "11111111111111111111111111111110";
                    mask10 = "255.255.255.254";
                    break;

                case "32":
                    mask2  = "11111111111111111111111111111111";
                    mask10 = "255.255.255.255";
                    break;
                }
                mask.Content = mask10;//выводим отображение маски в задание
            }
            else
            {
                mistakes      = mistakes + 1;
                wrong.Content = Convert.ToString(Convert.ToInt32(wrong.Content) + 1);
                MessageBox.Show("Ответ неверный, попробуйте еще раз");
            }
        }