public static bool VerifyCertificateChain(ArrayList certChain, byte[] leaf)
{
    X509Chain chain = new X509Chain();
    chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck; // not checking revocation for now

    // Here I add all offline certificates.
    foreach(byte[] cert in certChain)
    {
        chain.ChainPolicy.ExtraStore.Add(new X509Certificate2(cert));
    }

    bool ret = chain.Build(new X509Certificate2(leaf));

    // Always false for me.
    if(!ret)
    {
        // Here I get PartialChain status even though the chain is complete
        // since the rest of the chain is available online.
        foreach(X509ChainStatus status in chain.ChainStatus)
        {
            Console.WriteLine(status.ToString() + " - " + status.StatusInformation);
        }
    }

    return ret;
}