public static string encrypt(string toEncrypt)
        {
            if (toEncrypt == null)
            {
                return(null);
            }
            byte[] data = System.Text.Encoding.UTF8.GetBytes(toEncrypt);
            Sha256 sha  = new Sha256();

            sha.AddData(data, 0, (uint)data.Length);

            ICollection <byte> hash     = sha.GetHash();
            string             hashPass = Sha256.ArrayToString(hash.ToList <byte>());

            return(hashPass);
        }