protected void DLL_forms_SelectedIndexChanged(object sender, EventArgs e)
    {
        L_Idioma     logi        = new L_Idioma();
        DropDownList ddl         = (DropDownList)sender;
        int          id_form     = int.Parse(ddl.SelectedValue.ToString());
        int          id_language = int.Parse(DDL_Idiomas.SelectedValue.ToString());
        DataTable    data        = logi.obtner_controles(id_form, id_language);

        DDL_Controles.DataSource     = data;
        DDL_Controles.DataTextField  = "nom_control";
        DDL_Controles.DataValueField = "texto";
        DDL_Controles.DataBind();
        LB_Data.Text = DDL_Controles.SelectedValue.ToString();
    }