CertCloseStore(store, 0);

The CertCloseStore function closes a certificate store handle and reduces the reference count on the store. There needs to be a corresponding call to CertCloseStore for each successful call to the CertOpenStore or CertDuplicateStore functions.

[DllImport("CRYPT32.DLL", EntryPoint="CertCloseStore", CharSet=CharSet.Auto, SetLastError=true)]

public static extern bool CertCloseStore(IntPtr storeProvider, int flags);

    CertCloseStore(

    CertCloseStore(

            WinCapi.CertCloseStore(hSysStore, 0) ;

    BOOL      WINAPI CertCloseStore(HCERTSTORE hCertStore, DWORD dwFlags);

    public static extern bool CertCloseStore(

        WinCapi.CertCloseStore(hSysStore, 0);