System 2.0.0.0 4.0.0.0 System.Enum This enumeration is used to specify whether a revocation check occurs and if it is performed online or offline. Specifying an online check can result in a long delay while the certificate authority is contacted. Specifies the mode used to check for X509 certificate revocation. Field 2.0.0.0 4.0.0.0 System.Security.Cryptography.X509Certificates.X509RevocationMode No revocation check is performed on the certificate. Field 2.0.0.0 4.0.0.0 System.Security.Cryptography.X509Certificates.X509RevocationMode A revocation check is made using a cached certificate revocation list (CRL). Field 2.0.0.0 4.0.0.0 System.Security.Cryptography.X509Certificates.X509RevocationMode A revocation check is made using an online certificate revocation list (CRL).