public Service1(){
            InitializeComponent();
            CPUInfo = new CPUEntity();
            PC = new PerformanceContext();
            RacunaloInfo = new RacunaloEntity();
            RacunaloInfo.Naziv = Environment.MachineName;
            RacunaloInfo.CPU = CPUInfo;
            CPUInfo.RacunaloID = RacunaloInfo;
            var myComputer = new Computer();
            myComputer.CPUEnabled = true;
            myComputer.ToCode();
            myComputer.Open();
            string NazivCPUa=null;
            foreach (var hardware in myComputer.Hardware){
                if (hardware.HardwareType == HardwareType.CPU)
                {
                    NazivCPUa = hardware.Name;
                }}
            CPUInfo.NazivCPU = NazivCPUa;
            CPUInfo.KriticnaTemperatura = kriticnaTemperatura;
            var racunalo = PC.Racunalo_Info.Any(v => v.Naziv == RacunaloInfo.Naziv);
            int ID = -1;
            if (!racunalo){
                PC.Racunalo_Info.Add(RacunaloInfo);
                PC.Cpu_Info.Add(CPUInfo);

                PC.SaveChanges();
                ID = Convert.ToInt32(CPUInfo.Id);
            }
            else{
                var racunaloTemp = PC.Racunalo_Info.Where(xy => xy.Naziv == RacunaloInfo.Naziv).SingleOrDefault();
                RacunaloInfo = racunaloTemp;
                var cpuTemp = PC.Cpu_Info.Where(xy => xy.RacunaloID.Id == RacunaloInfo.Id).SingleOrDefault();
                CPUInfo = cpuTemp;
                ID = Convert.ToInt32(CPUInfo.Id);
            }
        }