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  • Category: .NET

    How to get computer serial number using windows application c# on windows 10 OS

    Please help me, i have a windows application that is working fine on machines with windows 7 operating system,but when I run/deploy the system on windows 10 machine it does not work.
    This app is suppose to get a serial number of the machine the app is running on,as well as the person logged in on a computer.

    Below is the code that i am using to get computer serial number,it is working well on windows 7,but not on windows 10.

    void GetSerialNumber()
    //Get machine serial number

    SelectQuery Sq = new SelectQuery("Win32_BIOS");
    ManagementObjectSearcher objOSDetails = new ManagementObjectSearcher(Sq);
    ManagementObjectCollection osDetailsCollection = objOSDetails.Get();
    foreach (ManagementObject mo in osDetailsCollection)

    string[] BIOSVersion = (string[])mo["BIOSVersion"];
    string s2 = null;
    foreach (string version in BIOSVersion)
    s2 += version;

    lblserialno.Text = mo["SerialNumber"].ToString();

  • #766673

    Have you got any error, while run the same in Windows 10. Please post more details what happen exactly when you run the same in Windows 10.

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  • #766688
    you are selecting the "Win32_BIOS" why can not you try "
    "Win32_OperatingSystem=@". Try the following and

    ManagementObject myManagementObject = new ManagementObject("Win32_OperatingSystem=@");
    string MySN = (string)myManagementObject["SerialNumber"];

    If you want to get is from the registry you can the the following also

    RegistryKey keyBaseX64 = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64);
    RegistryKey keyBaseX86 = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32);
    RegistryKey keyX64 = keyBaseX64.OpenSubKey(@"SOFTWARE\Microsoft\Cryptography", RegistryKeyPermissionCheck.ReadSubTree);
    RegistryKey keyX86 = keyBaseX86.OpenSubKey(@"SOFTWARE\Microsoft\Cryptography", RegistryKeyPermissionCheck.ReadSubTree);
    object resultObjX64 = keyX64.GetValue("MachineGuid", (object)"default");
    object resultObjX86 = keyX86.GetValue("MachineGuid", (object)"default");

    By Nathan
    Direction is important than speed

  • #766729
    Hi Nathan,
    Thank you for your response,the code above I think is giving me the serial number of the operating system.i need a serial number of the computer.

    see attachment for the error message I am getting when I use Win32_BIOS / BIOSVersion

    Basically on the foreach loop on the code above, I get a NULLReferenceException error "Object reference not set to an instance of an object"

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