public static bool startTravel(int realLicenseNum, float numKm, BusLine myBusLine)
        {
            bool canStart = false;

            foreach (Bus CBus in myBusLine.m_busList)
            {
                if (CBus.m_licenseNum == realLicenseNum)
                {
                    //if (!((CBus.m_sum_Tr_Treat + numKm) > 20000 || (CBus.m_fuel + numKm) > 1200))
                    //{
                    //    //how do we use throw in C#
                    //    Console.WriteLine("can't do this travel - passed your limit!");
                    //}
                    if (!((CBus.m_sum_Tr_Treat + numKm) > 20000 || (CBus.m_fuel + numKm) > 1200))
                    {
                        CBus.m_sum_Tr_Treat     += numKm;
                        CBus.m_fuel             += numKm;
                        myBusLine.m_totalTravel += numKm;
                        CBus.m_sum_Tr           += numKm;
                        // Console.WriteLine("success!!");
                    }
                    break;
                }
            }

            return(canStart);
        }
        private static void busManagement()
        {
            //***************************************************   MY VARIABLES   ******************************************************

            string   licenseNum, yearTreat, monthTreat, dayTreat = "";
            int      realLicenseNum = 0, year = 0, realYear = 0, realYearTreat = 0, realMonthTreat = 0, realDayTreat = 0;
            float    numKm;
            DateTime lasTreatmentDate = DateTime.Now;
            BusLine  myBusLine = new BusLine();
            Bus      myBus = new Bus();
            Boolean  NotEnd = true, licenseOk = false, found = false;

            //***************************************************************************************************************************
            while (NotEnd)
            {
                Console.WriteLine("options:\n1: add a bus\n2: start travel\n3: bus check up\n4: total travel from last treatment\n5: exit");
                string choice     = "";
                int    realChoice = 0;
                getInt(choice, ref realChoice);
                switch (realChoice)
                {
                case (int)Menu.ADD:
                    ////////////////////////////////////////////////////////////////////////////////////////
                    /////                      GETING INPUT FROM USER
                    ///////////////////////////////////////////////////////////////////////////////////////

                    ///************************************ START YEAR INPUT *********************************
                    Console.WriteLine("please enter start year:");
                    //year = Console.ReadLine(); // get the year
                    //Int32.TryParse(year, out realYear);
                    realYear = getYear(out yearTreat, out realYearTreat);
                    ///************************************ LICENCE NUMBER INPUT *********************************

                    if (realYear <= 2018)
                    {
                        while (!licenseOk)
                        {
                            Console.WriteLine("please enter 7 digit license number");
                            licenseNum = Console.ReadLine();
                            Int32.TryParse(licenseNum, out realLicenseNum);
                            if (realLicenseNum >= 1000000 && realLicenseNum < 10000000)
                            {
                                licenseOk = true;
                            }
                            else
                            {
                                Console.WriteLine("the number you have enered isn't 7 digit number please try again!");
                            }
                        }
                        licenseOk = false;
                    }
                    else
                    {
                        while (!licenseOk)
                        {
                            Console.WriteLine("please enter 8 digit license number");
                            licenseNum = Console.ReadLine();
                            Int32.TryParse(licenseNum, out realLicenseNum);
                            if (realLicenseNum >= 10000000 && realLicenseNum < 100000000)
                            {
                                licenseOk = true;
                            }
                            else
                            {
                                Console.WriteLine("the number you have enered isn't 7 digit number please try again!");
                            }
                        }
                    }

                    ///************************************ LAST TREATMENT DATE INPUT *********************************

                    Console.WriteLine("please enter last treat date:");

                    getYear(out yearTreat, out realYearTreat);
                    getMonth(out monthTreat, out realMonthTreat);
                    getDay(out dayTreat, out realDayTreat);
                    lasTreatmentDate.AddYears(realYearTreat);
                    lasTreatmentDate.AddMonths(realMonthTreat);
                    lasTreatmentDate.AddDays(realDayTreat);

                    ///************************************ CREATING BUS FROM INPUT *********************************

                    Bus myNewBus = new Bus(realLicenseNum, 0, realYear, lasTreatmentDate);
                    myBusLine.add(myNewBus);
                    break;

                case (int)Menu.START:     // choice the bus that we want to use
                    Console.WriteLine("please enter the license number");
                    licenseNum = Console.ReadLine();
                    Int32.TryParse(licenseNum, out realLicenseNum);
                    Random r = new Random();
                    numKm  = (float)r.NextDouble();
                    numKm += r.Next(1200);
                    if (!startTravel(realLicenseNum, numKm, myBusLine))
                    {
                        Console.WriteLine("can't start this travel");
                    }

                    break;

                case (int)Menu.CHECKUP:
                    Console.WriteLine("license number:");
                    licenseNum = Console.ReadLine();
                    Int32.TryParse(licenseNum, out realLicenseNum);
                    Console.WriteLine("treatment - 1 , refueling 2 ");
                    choice = Console.ReadLine();
                    Int32.TryParse(choice, out realChoice);
                    foreach (Bus CBus in myBusLine.m_busList)
                    {
                        if (CBus.m_licenseNum == realLicenseNum)
                        {
                            switch (realChoice)
                            {
                            case 1:
                                CBus.m_time_Treat = DateTime.Now;
                                Console.WriteLine("success!!");
                                break;

                            case 2:
                                CBus.m_fuel = 0;
                                Console.WriteLine("success!!");
                                break;

                            default:
                                Console.WriteLine("you entered a wrong number!");
                                break;
                            }
                        }
                    }
                    break;

                case (int)Menu.TOTALTRAVEL:
                    Console.WriteLine("License Number:");

                    foreach (Bus CBus in myBusLine.m_busList)
                    {
                        if (CBus.m_yearStart <= 2018)
                        {
                            Console.WriteLine("{0} - {1} - {2} ", CBus.m_licenseNum / 100000, (CBus.m_licenseNum / 100) % 1000, CBus.m_licenseNum % 100);
                        }
                        else
                        {
                            Console.WriteLine("{0} - {1} - {2} ", CBus.m_licenseNum / 100000, (CBus.m_licenseNum / 1000) % 100, CBus.m_licenseNum % 1000);
                        }

                        Console.WriteLine("{0},sum travel from last treatment!", CBus.m_sum_Tr_Treat);
                    }
                    break;

                case (int)Menu.EXIT:
                    Console.WriteLine("bye bye!!!");
                    NotEnd = false;
                    break;

                default:
                    Console.WriteLine("wrong choice please try again!");
                    break;
                }
                int[,] p = new int[1, 3];
                int sum = p.GetLength(0);
            }
        }