Mysql write text on blob with UTF8

See more:

C#

Visual-Studio

MySQL

When write on Blob field with Encoding UTF 8 , the caracter write are wrong

table tb_Language
charset/collation utf8 -- utf8_bin
engine InnoDb

if insert the string by hand with MySqlWorkBench the result is correct

What I have tried:

MySqlCommand cmdMySqlN = new MySqlCommand("", Connection);
cmdMySqlN.CommandText = "INSERT INTO tb_Language (Text) VALUES (@text)"; ;

try
            {
                myTrans = Connection.BeginTransaction();

                Encoding utf8 = Encoding.UTF8;

                //Unicode string:
                string test = "abcéabc Colón à @ ç § ";                                

                byte[] utfBytes = utf8.GetBytes(test);

                //parameter for Blob
                cmdMySqlN.Parameters.AddWithValue("@text", utfBytes);

                cmdMySqlN.Transaction = myTrans;

                cmdMySqlN.ExecuteNonQuery();
                myTrans.Commit();
            }

            catch (Exception ex)
            {
                myTrans.Rollback();
                string Message = "Error " + ex.Message;
            }

read with MySqlWorkBench
and the result is <pre>abcéabc Colón à @ ç §

may be here the error
byte[] utfBytes = utf8.GetBytes(testo);