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To authenticate the certificate saved in a .p7b file using X509Certificate2, you can follow these steps:

1. Load the certificate from the .p7b file using the X509Certificate2 constructor that takes a byte array as an argument.

byte[] certData = File.ReadAllBytes("certificate.p7b");
X509Certificate2 cert = new X509Certificate2(certData);

1. Verify the certificate chain to ensure that the certificate is trusted and valid.

X509Chain chain = new X509Chain();
chain.Build(cert);
if (chain.ChainStatus.Length == 0)
{
    // Certificate is trusted and valid
}
else
{
    // Certificate chain validation failed
}

1. Check the certificate properties to ensure that it matches the expected certificate.

if (cert.SubjectName.Name == "CN=example.com")
{
    // Certificate is valid for example.com
}
else
{
    // Certificate is not valid for example.com
}

By following these steps, you can use X509Certificate2 to authenticate the certificate saved in a .p7b file.