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The WebApplicat ion1 sam ple, like m ost of t he sam ples in t his chapt er , exist s as t wo folder s. Bot h folders hav e t he nam e WebApplicat ion1. One cont ains j ust t wo files in it s r oot . One of t hese files is WebApplicat ion1.sln. The folder cont aining t his file belongs in t he dir ect ory t hat your com put er uses for st or ing Visual Basic .NET Windows solut ions. You can open t he WebApplicat ion1 solut ion in Visual St udio by choosing Open Solut ion from t he File m enu and select ing WebApplicat ion1.sln. You m ay need t o br owse t o t he folder cont aining WebApplicat ion1.sln befor e being able t o select it . The second folder cont ains WebFor m 1.aspx in it s root . This folder belongs in t he ww wroot direct ory of t he I net pub folder on t he com put er fr om which you will be r unning t he applicat ion. You can open t he Web page by browsing ht t p: / / < webserver> / WebApplicat ion1/ WebFor m 1.aspx .
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Recall t hat t he WebApplicat ion1 proj ect fr om Chapt er 8 cont ains t wo cont r ols: a but t on and a label. Click ing t he but t on causes t he label t o show Hello Wor ld. Figur e 11- 2 rev eals t he but t on cont r ol above t he label cont rol in Design view for WebApplicat ion1 s WebForm 1.aspx file. Bot h cont rols are Web serv er cont rols. I select ed t hem fr om t he Web Form s t ab of t he Toolbox. When y ou add a cont r ol from t he Toolbox t o a Web page, y ou can select it in t he Toolbox and t hen size t he cont rol by dr agging it out on y our Web page. Alt ernat iv ely, y ou can right - click t he cont rol t ype in t he Toolbox and choose Copy . Then r ight - click in Design v iew
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for t he Web page, and choose Past e. This adds t he cont rol wit h pr econfigur ed size set t ings in t he upper left corner of t he page. I f your docum ent has a Gr idLayout set t ing for it s pageLayout pr opert y , y ou can t hen j ust drag t he cont r ol t o it s desired locat ion. Figur e 11- 2 shows t he label and but t on cont r ols w it h t heir preconfigur ed size set t ings. Figu re 1 1 - 2 . Th e ASP.N ET D e sign vie w for W e bFor m 1 .a sp x in t h e W eb Applica t ion 1 pr oj e ct .
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Figur e 11- 2 shows sev eral t oolbars. All t he cont rols on t he bot t om row, aft er t he first t wo, belong t o t he Layout t oolbar. I f t his t oolbar isn t v isible, y ou can m ak e it appear in t he usual way for Windows applicat ions r ight - click any t oolbar, and select t he one y ou want ( Layout ) from t he cont ext m enu. ( You can also select Toolbars from t he View m enu and select t he appropriat e t oolbar from t he list . ) The cont r ols on t his t oolbar can m ake fast work of t ypical form layout design t asks, such as aligning, sizing, and spacing cont rols. Not ice also in t he figur e t hat t he Web page appears wit h a gr id. The default set t ing is for cont rols t o snap t o t he grid m arks as you m ov e cont r ols around t he form . I f you pr efer m or e granular posit ioning or you don t want t o show a gr id, you can achieve t hese result s by choosing Opt ions from t he Tools m enu. I n t he Opt ions dialog box , Open t he HTML Designer folder and select Display. The right port ion of t he dialog box t hen rev eals cont r ols for set t ing t he Snap To Gr id and Show Gr id opt ions. This port ion of t he Opt ions dialog box also includes t ext boxes for y ou t o specify t he spacing bet ween grid m ark s in Design v iew. You can also cont r ol t he appearance of t he grid by r ight - click ing any blank ar ea of a page in Design view and choosing Pr opert ies. I f t he pageLay out propert y for a page is Gr idLayout , t he General t ab of t he DOCUMENT Propert y Pages dialog box exposes t he Show Gr id check box. Clearing t he check box st ops t he grid fr om appear ing, but cont rols st ill snap t o t he gr id w hen y ou m ove t hem . I f you swit ch fr om Design v iew t o HTML v iew, you can see t he for m and / form t ags inside bounding body and / body t ags. Just as t he form and / form t ags are wit hin body and / body t ags, so ar e t he t ags for t he but t on and label cont r ols wit hin t he t ags for t he form . You can see fr om t he following HTML ex cer pt for t he WebForm 1.aspx page t hat t he but t on and label cont r ols ar e Web serv er cont r ols
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because t heir init ial t ag begins wit h t he asp pr efix ( asp: But t on and asp: Label) . Aft er t he t ag designat ion init iat ing a cont r ol, a series of at t r ibut e set t ings defines t he cont rol feat ures. The at t ribut e set t ings are so num er ous t hat t hey cause t he cont r ol t ag t o w rap t o a second line. The id at t r ibut e indicat es t he nam e by w hich your pr ogram can refer t o t he cont r ol. The TOP at t ribut e designat es how far down, in pix els, a cont r ol is fr om t he t op page border . Not ice t hat t he label cont r ol is 40 pix els fart her dow n t he page t han t he but t on. The but t on cont rol is 7 pix els closer t o t he page s left border t han t he label cont r ol. <body MS_POSITIONING="GridLayout"> <form id="Form1 method="post runat="server"> <asp:Button id="Button1 style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 8px runat="server Text="Button"> </asp:Button> <asp:Label id="Label1 style="Z-INDEX: 102; LEFT: 15px; POSITION: absolute; TOP: 48px runat="server">Label </asp:Label> </form> </body> Right - click ing any blank area in t he Design v iew t hat appears in Figur e 11- 2 opens a cont ext m enu from which y ou can choose View Code. This exposes t he Visual Basic code behind t he form . ( See Figur e 11- 3.) The t ab display ing t he code behind t he form has t he nam e WebForm 1.aspx.vb. This is also t he nam e of t he file cont aining t he code behind t he form . The Solut ion Explor er window t o t he right of t he code w indow shows t he WebForm 1.aspx.vb file select ed. You won t see t his file unless y ou ve select ed Show All Files on t he Solut ion Explorer t oolbar . The declarat ions at t he t op of t he m odule w indow indicat e t hat t he code r esides in a class inst ance nam ed WebForm 1, which inher it s pro- pert ies, m et hods, and ev ent s from t he Page nam espace in t he Syst em .Web.UI hierarchy. I n addit ion, t he But t on1 and Label1 cont r ols on t he Web page ar e inst ances of t he But t on and Label classes. The definit ions for t he But t on and Label classes reside in t he Syst em .Web.UI .WebCont r ols nam espace.
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