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

public static extern IntPtr CertEnumCertificatesInStore( IntPtr storeProvider, IntPtr prevCertContext);

     <DllImport("crypt32.dll", EntryPoint:="CertEnumCertificatesInStore", CharSet:=CharSet.Auto, SetLastError:=True)> _

    Public Shared Function CertEnumCertificatesInStore( _

        while ((certContext = CertEnumCertificatesInStore(hCertStore, certContext)) != IntPtr.Zero)