var clientSettings1 = new MongoClientSettings()
            {
                SslSettings = new SslSettings
                {
                    ClientCertificates = new X509Certificate2[] { new X509Certificate2("path", "pass") }
                }
            };            var client1 = new MongoClient(clientSettings1);
            var clientSettings2 = new MongoClientSettings()
            {
                SslSettings = new SslSettings
                {
                    ClientCertificates = null
                }
            };
            var client2 = new MongoClient(clientSettings2);