System.Data.SqlTypes.SqlString.GetUnicodeBytes C# (CSharp) Method

        public byte[] GetUnicodeBytes()
        {
            if (IsNull)
                return null;

            return s_unicodeEncoding.GetBytes(_value);
        }

 public static SqlBytes Sha256(SqlString text)
 {
     HashAlgorithm hash = new SHA256Managed();
     return new SqlBytes(hash.ComputeHash(text.GetUnicodeBytes()));
 }