MySQL - VB.NET - MD5

I'm sure this is going to be an "it's easy when you know how..." but here goes.

If I run this on a MySQL command line I get what I expect:
mysql> SELECT MD5('test text') AS strMD5;
+----------------------------------+
| strMD5                        |
+----------------------------------+
| 1e2db57dd6527ad4f8f281ab028d2c70 |
+----------------------------------+
1 row in set (0.00 sec)

However if I do this:
            strSQL = "SELECT MD5('test text') AS strMD5"
            objSQLCommand.CommandText = strSQL
            objDataAdapter = New MySqlDataAdapter()
            objDataAdapter.SelectCommand = objSQLCommand


            objDataSet = New DataSet
            objDataSet.DataSetName = "xxxx"

            objDataAdapter.Fill(objDataSet, "yyyy")

            objDataSet.WriteXml(Response.OutputStream)

I get:
<xxxx>
  <yyyy>
    <strMD5>MWUyZGI1N2RkNjUyN2FkNGY4ZjI4MWFiMDI4ZDJjNzA=</strMD5>
  </yyyy>
</xxxx>

Why is the result different?
Mike