C # Digital Certificate A3 CPF Token

I have to put a digital certificate of type CPF A3 token with password in an HttpWebRequest, so I was trying to use the X509Certificate2, as follows:

    private X509Certificate2 GetCert(string CertFile, string CertPass)
    {
        FileStream fs = new FileStream(CertFile, FileMode.Open);
        byte[] buffer = new byte[fs.Length];
        fs.Read(buffer, 0, buffer.Length);
        X509Certificate2 cert = new X509Certificate2(buffer, CertPass);
        fs.Close();
        fs.Dispose();
        return cert;
    }

    //chamo assim
    GetCert("C:\certificado.cer", password);

But I was informed that this was to read certificates on my computer, so I tried the code below

        X509Store my = new X509Store(StoreName.My, StoreLocation.CurrentUser);
        //my.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
        my.Open(OpenFlags.ReadOnly);


        // Find the certificate we'll use to sign            
        RSACryptoServiceProvider csp = null;
        foreach (X509Certificate2 cert in my.Certificates)
        {
            var x509 = cert;
            byte[] rawData = x509.RawData;
            Console.WriteLine("Content Type: {0}", X509Certificate2.GetCertContentType(rawData));
            Console.WriteLine("Serial Number: {0}", x509.SerialNumber);
            Console.WriteLine("Friendly Name: {0}", x509.FriendlyName);
            //continue

Just that this code is working OK only for CNPJ certificates, when I use CPF it asks me to pry a certified pen drive ... One more strange thing is: he is reading all the certificates that one day I already I installed it on my computer ...