Cha pt e r 9 . Cr e a t ing W indow s Applica t ion s in VB.NET

Making Data Matrix ECC200 in VB.NET Cha pt e r 9 . Cr e a t ing W indow s Applica t ion s

Cha pt e r 9 . Cr e a t ing W indow s Applica t ion s
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Windows applicat ions in t he .NET Fram ew or k ar e applicat ions based on one or m or e Windows Form s. These applicat ions t arget com put ers t hat can run code behind a form and prov ide a r ich env ir onm ent t o t he user. Each form in a Windows applicat ion is an inst ance of t he Windows Form class. This class behaves sim ilar ly t o t he form s in prior v ersions of Visual Basic ( and ot her Microsoft dev elopm ent env ironm ent s such as Microsoft Access form s) , but t he Windows Form class in t he .NET Fram ework is dist inct and independent of form s in ear lier Micr osoft dev elopm ent env ir onm ent s. I t is conv enient t o t hink of t he Form class as a die or a m old from which you der ive specific inst ances of a form . Like ot her classes, t he For m class is a collect ion of propert ies, m et hods, and ev ent s. The for m s in y our Windows applicat ions inher it t he Form class propert ies, m et hods, and ev ent s. This chapt er cov ers creat ing solut ions wit h Windows applicat ions and m anaging t he Windows Form s in t hose applicat ions w it h Visual Basic .NET code. The focus of t he chapt er is on int erm ediat e t o advanced t opics, such as cr eat ing and using classes, inherit ance, ev ent pr ogram m ing, and handling run- t im e er ror s wit h st ruct ur ed except ion handling. For each t opic cov er ed, I ident ify what s new for t he t opic w it h Visual Basic .NET. I n som e cases, such as inherit ance and st ruct ur ed except ion handling, t he em phasis is wholly on what s new because Visual Basic .NET int r oduces t hese capabilit ies t o Visual Basic program m ers.
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Ge t t in g St a r t e d w it h W in dow s For m s
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Windows Form s ex ist wit hin Windows applicat ions. You can cr eat e t he shell for a Windows applicat ion from a t em plat e w it hin Visual St udio .NET. Windows applicat ions ar e for env ironm ent s t hat find it efficient t o t ake advant age of t he local processing power of client w or kst at ions. When developing solut ions based on t he Windows Applicat ions t em plat e, you w ill oft en use Windows For m s t o m anage int eract ion w it h users and display infor m at ion t o users. This sect ion int r oduces y ou t o t he basics of creat ing and m anaging solut ions based on Windows Form s.
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St a r t w it h For m 1 in a W in dow s Applica t ion
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You can cr eat e a Windows applicat ion fr om t he Visual St udio .NET St art Page. I f you follow ed t he inst r uct ions in Chapt er 1 for configuring Visual St udio .NET and t he St art Page, you can open t he St art Page by click ing t he Windows St art but t on, choosing Program s, select ing t he Micr osoft Visual St udio .NET folder, and t hen select ing Micr osoft Visual St udio. Begin a new Windows applicat ion by click ing New Proj ect on t he St art Page and select ing t he Windows Applicat ion t em plat e in t he New Pr oj ect dialog box . Next ent er a pr oj ect nam e, such as St art Wit hForm 1. Visual St udio assigns a default folder for your pr oj ect s assem bly of files, but y ou can ov err ide t he default locat ion for a solut ion s assem bly folder by eit her t yping t he pat h t o t he alt er nat e folder or br owsing t o it . Figur e 9- 1 illust rat es t he New Pr oj ect dialog box set t o creat e a new Windows applicat ion nam ed St art Wit hForm 1 in t he VisualSt udioPr oj ect s folder of t he C: \ Docum ent s and Set t ings\ Adm inist rat or\ My Docum ent s pat h.
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Figu re 9 - 1 . St ar t a W in dow s a pplica t ion by se le ct in g W ind ow s App licat ion in t h e N e w Proj e ct dia log box .
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Click OK in t he New Pr oj ect dialog box t o creat e a new proj ect for a Windows applicat ion. Visual St udio opens t he Windows Form s Designer env ironm ent . The Windows Form s Designer w indow, Form 1.vb[ Design] , enables y ou t o graphically m anipulat e t he form for an applicat ion. For ex am ple, y ou can use t he Toolbox t o add cont r ols t o a form , and y ou can add code behind t he ov erall form as well as t he cont rols on a form in t he Windows Form s Designer. The ov erall Visual St udio .NET dev elopm ent env ir onm ent should show t hr ee w indows at t his point . I n addit ion t o t he Windows Form s Designer, y ou should see t o t he r ight Solut ion Explor er and t he Proper t ies w indow. Solut ion Explorer pr ov ides a t r ee view, m uch lik e Windows Explor er, of t he it em s in t he proj ect for a solut ion. The Pr opert ies window pr ov ides an int erface for m anually v iewing and updat ing t he set t ings for select ed it em s in Solut ion Explorer or t he it em s on a form . Figur e 9- 2 shows a blank form Form 1 in t he Windows For m s Designer . Solut ion Explor er displays t he Form 1.vb file. This file cont ains your graphical design changes as well as any code behind t he form . The Assem bly .vb file in t he Visual St udio .NET dev elopm ent envir onm ent enables you t o v iew assem bly at t ribut es, such as version num bers for a solut ion. I expanded t he Refer ences folder in Solut ion Explorer so you can see select ed refer ences available t o Form 1, including t he Syst em .Windows.Form s nam espace. The Pr opert ies w indow below Solut ion Explor er shows t hat t he Text pr opert y set t ing for t he form is Form 1. You can t ype ov er t he Text propert y set t ing t o assign a m or e m eaningful capt ion t o y our form . Figu re 9 - 2 . Th e in it ia l layou t for a W in d ow s a pp lica t ion in clu de s a bla n k for m a n d a few re fe re n ce s t o se lect e d n a m esp ace s.
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