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Need some help wiht :CAST AS Double

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Last Modified: 2016-09-14
Hello,
I would like to cast Breite1, Laenge, Staerke AS double that this query will work right.
In my sql they have the typ: varchar.

Sql_Search_String.Format("SELECT * FROM Angebot_Anfrage WHERE Angebot_Anfrage='%s' AND\
                                                       Typ>='%s' AND Typ<='%s' AND\
                                                       Staerke>='%s' AND Staerke<='%s' AND\
                                                       Breite1>='%s' AND Breite1<='%s' AND\
                                                       Laenge>='%s' AND Laenge<='%s'AND\
                                                       Gewicht>='%s' AND Gewicht<='%s' AND\
                                                       KdNr>='%s' AND KdNr<='%s' AND\
                                                       CONVERT(datetime,Ausstellungsdatum)>='%s' AND CONVERT(datetime,Ausstellungsdatum)<='%s' AND\
                                                       Guete LIKE '%s' AND Kennzahl_Auftrag_erhalten=1 \
                                                       ORDER BY Typ ASC, Abmessung ASC,\
                                                       Ausstellungsdatum DESC, Gewicht ASC,Nr ASC",\
                                                       str_Angebot_Anfrage,suche_Typ_von,suche_Typ_bis,\
                                                       suche_Staerke_von,suche_Staerke_bis,\
                                                       suche_Breite_von,suche_Breite_bis,\
                                                       suche_Laenge_von,suche_Laenge_bis,\
                                                       suche_Gewicht_von,suche_Gewicht_bis,\
                                                       suche_Kunde_von,suche_Kunde_bis,\
                                                       suche_AngebotsDatum_von,suche_AngebotsDatum_bis,\
                                                       suche_Artikelkurzbezeichnung,str_Auftrag_erhalten);


I tried this:
Sql_Search_String.Format("SELECT * FROM Angebot_Anfrage WHERE Angebot_Anfrage='%s' AND\
                                                       Typ>='%s' AND Typ<='%s' AND\
                                                       CAST(Staerke AS Double)>='%s' AND CAST(Staerke AS Double)<='%s' AND\
                                                       CAST(Breite1 AS Double)>='%s' AND CAST(Breite1 AS Double)<='%s' AND\........
will not work
Please help.
Thank you.
Best regards,
Thomas


P.S. Sql Server 2000
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