Get Databasefield Value Follow

Hi there,

I have problems to get an DataBaseField value.

I want to set this Value on a Label in my program.The SetSubString Method is good, but I need something like GETSUBSTRING.

 Artikel = textBoxArtikel.Text;
            anzahl = Convert.ToInt32(textBoxStueckzahl.Text);
            using (Engine btEngine = new Engine())
            {
                btEngine.Start();
                LabelFormatDocument btFormat = btEngine.Documents.Open("C://Users//Carsten//Desktop//MarcoPolo38x68.btw");
                btFormat.DatabaseConnections.QueryPrompts["Abfrage-Eingabe1"].Value = Artikel;              
                LABEL.TEXT= ?????????
                btFormat.PrintSetup.IdenticalCopiesOfLabel = anzahl;
                comboBoxDrucker.SelectedItem = btFormat.PrintSetup.PrinterName;
                btFormat.Print();