[Mono-list] ComboBox: can't select item

[Marcos Perez]

hi, i'n developping a application on mono using Csharp

i use a combobox, where the data is loaded from a database, then the user
must select one option, but, when try to select one option, the terminal
display this menssaje gtk_entry_set_text: assertion `text != NULL' failed,
and nothing is selected... =S

i'm using this code where data is a stringconection





public void Cargar_Datos (string data, Gtk.ComboBoxEntry comboBox)
    {


        ListStore listStore = new Gtk.ListStore(typeof(string));
        comboBox.Model = listStore;
        CellRendererText text = new CellRendererText();
        comboBox.PackStart(text, false);
        comboBox.AddAttribute(text, "text", 0);


        MySqlConnection conexion = new MySqlConnection(datos);
        conexion.Open();
        string query = "SELECT cod_concept, description FROM concepts ORDER
BY cod_concept";
        MySqlCommand select = new MySqlCommand(query, conexion);
        MySqlDataReader lector;
        lector = select.ExecuteReader();

            while (lector.Read())
            {
                string value= lector.GetString(0)+" | "+ lector.GetString
(1);
                listStore.AppendValues(valor);
            }


        lector.Close();
        conexion.Close();
    }

i need help to solve that!!

Thanks!!!
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