private static void SignAllParts(Package package)
{
    if (package == null)
        throw new ArgumentNullException("SignAllParts(package)");

    // Create the DigitalSignature Manager
    PackageDigitalSignatureManager dsm =
        new PackageDigitalSignatureManager(package);
    dsm.CertificateOption =
        CertificateEmbeddingOption.InSignaturePart;

    // Create a list of all the part URIs in the package to sign
    // (GetParts() also includes PackageRelationship parts).
    System.Collections.Generic.List<Uri> toSign =
        new System.Collections.Generic.List<Uri>();
    foreach (PackagePart packagePart in package.GetParts())
    {
        // Add all package parts to the list for signing.
        toSign.Add(packagePart.Uri);
    }

    // Add the URI for SignatureOrigin PackageRelationship part.
    // The SignatureOrigin relationship is created when Sign() is called.
    // Signing the SignatureOrigin relationship disables counter-signatures.
    toSign.Add(PackUriHelper.GetRelationshipPartUri(dsm.SignatureOrigin));

    // Also sign the SignatureOrigin part.
    toSign.Add(dsm.SignatureOrigin);

    // Add the package relationship to the signature origin to be signed.
    toSign.Add(PackUriHelper.GetRelationshipPartUri(new Uri("/", UriKind.RelativeOrAbsolute)));

    // Sign() will prompt the user to select a Certificate to sign with.
    try
    {
        dsm.Sign(toSign);
    }

    // If there are no certificates or the SmartCard manager is
    // not running, catch the exception and show an error message.
    catch (CryptographicException ex)
    {
        MessageBox.Show(
            "Cannot Sign\n" + ex.Message,
            "No Digital Certificates Available",
            MessageBoxButton.OK,
            MessageBoxImage.Exclamation);
    }
}// end:SignAllParts()