c# Get a certificate from a container and set a pin / password programmatically

        public static X509Certificate2 GetCertStorePass(string pin, X509Certificate2 certificate2)
        {
            var provider = (Gost3410CryptoServiceProvider)certificate2.PrivateKey;
            var secure = new System.Security.SecureString();

            foreach (char charPass in pin)
                secure.AppendChar(charPass);
            provider.SetContainerPassword(secure);

            return provider.ContainerCertificate;
        }

C# Получаем короткое имя из Subject сертификата

public static string GetSubjectCN(X509Certificate2 cert)
        {
            // вырезаем имя из строки            
            int indexStart = cert.Subject.IndexOf("CN");
            if (indexStart >= 0)
            {
                int indexEnd = cert.Subject.IndexOf(",", indexStart);
                indexStart += 3;
                if (indexStart < indexEnd)
                {
                    return cert.Subject.Substring(indexStart, indexEnd - indexStart);
                }
            }
            return null;
        }

C# How to get all certificates from "My" Store

public static List<string> GetCertNamesFromStore(string search)
        {
            X509Store store = new X509Store("My");
            try
            {
                store.Open(OpenFlags.ReadOnly);
                X509Certificate2Collection certCollection = store.Certificates;
                X509Certificate2Collection currentCerts = certCollection.Find(X509FindType.FindByTimeValid, DateTime.Now, false);
                var res = new List<string>();
                foreach (X509Certificate2 s in certCollection)
                {
                    if (search=="")
                        res.Add(GetSubjectCN(s));
                    else if (s.SubjectName.Name.Contains(search))
                        res.Add(GetSubjectCN(s));
                }
                return res;
            }
            finally
            {
                store.Close();
            }
        }