convert string to barcode c# Popu la t ing List Box a n d D a t a Gr id Con t r ols in VB.NET

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One of t he m ost com m on dat a applicat ions let s users choose from one cont r ol so t hat t hey det erm ine t he dat a appearing in one or m ore ot her cont r ols. The sam ple in t his sect ion let s a user choose fr om a list box t o det erm ine t he subset of dat a t hat appears in a dat a grid. The list box value has a parent relat ionship wit h t he values appear ing in t he dat a grid. Bot h t he list box and t he dat a gr id der iv e t heir values fr om a SQL Serv er dat abase t hr ough SqlConnect ion and SqlDat aAdapt er obj ect s. This sam ple also describes t he Aut oPost Back propert y , which is a special List Box cont rol pr opert y for ASP.NET applicat ions. W e b Pag e Layou t a nd Ope ra t ion The sam ple ex ist s as WebForm 1.aspx in t he List ToGr id proj ect . Figur e 11- 16 shows t he Design view of WebForm 1.aspx. Four cont r ols appear on t he page. These are a list box, a t ext box, a but t on, and a dat a gr id. I n addit ion, t wo ADO.NET cont r ols, a SqlConnect ion obj ect and a SqlDat aAdapt er obj ect , appear in t he syst em t ray at t he bot t om of t he page. These lat t er t w o cont r ols don t appear on t he Web page, but t hey are av ailable for use by t he code behind t he page. By graphically cr eat ing t he t wo ADO.NET cont rols on t he page, y ou save having t o wr it e t he code t o declar e and inst ant iat e t he obj ect s. Figu r e 1 1 - 1 6 . A D e sign vie w of W e b Form 1 .a spx in t h e List ToGr id pr oj e ct .
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Use t he Dat a t ab on t he Toolbox t o drag t he SqlDat aAdapt er t o t he Web page. Aft er y ou finish int er act ing w it h it s wizard, Visual St udio .NET w ill aut om at ically creat e a SqlConnect ion obj ect . This sam ple connect s t o t he Nort hwind dat abase. See Chapt er 1 for m or e det ails of t he st eps for adding SqlDat aAdapt er and SqlConnect ion obj ect s graphically. The sam ple in t his sect ion uses t he following SQL st r ing t o specify t he rowset t hat t he dat a adapt er will ev ent ually load int o a dat a set . The sam ple applicat ion ult im at ely assigns t he dat a set t o t he Dat aSource propert y of t he Dat aGr id cont r ol. SELECT ProductID, ProductName, CategoryID, UnitPrice, UnitsInStock, UnitsOnOrder, Discontinued FROM Products The nam es for all t he cont r ols on t he page end wit h a 1 appended t o t he nam e of t he t ype of cont rol. For exam ple, t he list box, but t on, and SqlDat aAdapt er cont r ols ar e r espect ively List Box1, But t on1, and SqlDat aAdapt er1. Because t her e is j ust one it em for each t ype of cont rol, t he sam ple discussion r efers t o individual cont r ols by t he cont rol s t ype nam e. Not ice t hat no dat a appears in any of t he cont r ols. The Dat aSource propert ies for t he List Box and Dat aGr id cont r ols don t hav e design- t im e assignm ent s. You can set t he Dat aSource pr opert ies for t hese cont rols eit her at design t im e or at run t im e. One advant age t o assigning t he Dat aSour ce propert y at r un t im e is t hat you can m ak e t he assignm ent dy nam ic depending on ot her fact ors. For exam ple, t he sam ple set s t he Dat aSource pr opert y for t he Dat aGr id cont rol based on t he select ion in t he List Box cont r ol. You can also use a Session st at e var iable, det erm ined by any of t he t echniques described ear lier in t his chapt er, t o cont r ibut e t o t he specificat ion of t he Dat aSource pr opert y for t he List Box and Dat aGr id cont rols. The List Box cont r ol has it s Aut oPost Back proper t y set t o Tr ue in t he Pr opert ies dialog box . The pr opert y allows select ions from a list box t o post back im m ediat ely t o t he Web serv er . I n m any Web applicat ions, im m ediat ely post ing a select ion fr om a list box t o a Web server isn t necessary. Therefore, t he default set t ing for t his pr opert y is False. I n addit ion, t he pr opert y doesn t work unless Act iv e Scr ipt ing is enabled for a br owser. Because enabling t he Act iv e Script ing
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feat ur e can expose a br owser t o a securit y v iolat ion, som e br owser users m ay elect t o disable t he feat ur e ( Act ive Scr ipt ing) . For t his r eason, t he sam ple offers a but t on. By click ing t he but t on, users can force a post back of t he Web page t o t he Web serv er . By post ing back t he select ion from t he list box one way or t he ot her, t he Web ser ver is able t o dy nam ically set t he Dat aSource propert y for t he Dat aGr id cont rol based on t he m ost r ecent select ion from t he List Box cont rol.
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