private static List <Email> DecryptEmails(List <Email> encryptedEmails)
        {
            List <Email> decryptedEmails = new List <Email>();

            foreach (Email encryptedEmail in encryptedEmails)
            {
                Email decryptedEmail = new Email(encryptedEmail.Seen, encryptedEmail.Sender, encryptedEmail.Subject, encryptedEmail.Date, encryptedEmail.Body, encryptedEmail.UId);
                decryptedEmail.Sender  = EncryptService.Decrypt(encryptedEmail.Sender);
                decryptedEmail.Subject = EncryptService.Decrypt(encryptedEmail.Subject);
                decryptedEmail.Body    = EncryptService.Decrypt(encryptedEmail.Body);
                decryptedEmails.Add(decryptedEmail);
            }
            return(decryptedEmails);
        }
        private static List <Email> EncryptEmails(List <Email> unencryptedEmails)
        {
            List <Email> encryptedEmails = new List <Email>();

            foreach (Email unencryptedEmail in unencryptedEmails)
            {
                Email encryptedEmail = new Email(unencryptedEmail.Seen, unencryptedEmail.Sender, unencryptedEmail.Subject, unencryptedEmail.Date, unencryptedEmail.Body, unencryptedEmail.UId);
                encryptedEmail.Sender  = EncryptService.Encrypt(unencryptedEmail.Sender);
                encryptedEmail.Subject = EncryptService.Encrypt(unencryptedEmail.Subject);
                encryptedEmail.Body    = EncryptService.Encrypt(unencryptedEmail.Sender);
                encryptedEmails.Add(encryptedEmail);
            }
            return(encryptedEmails);
        }