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Not ice t he I m port s st at em ent at t he t op of Module1 t hat references t he Syst em .Dat a.SqlClient nam espace. This is necessary for t he abbreviat ed st yle used by t he sam ple t o refer t o t he SqlConnect ion class. The sam ple in t he Connect ing from a Windows Form sect ion lat er in t his chapt er illust r at es anot her convent ion for r efer encing t he SqlConnect ion class t hat doesn t r equire t he I m por t s st at em ent .
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The sam ple code for t he I nt egrat edCnnToNort hwind procedur e appears next . I t begins w it h a declarat ion for cnn1 as a SqlConnect ion class inst ance. The st at em ent bot h declar es and inst ant iat es t he cnn1 obj ect r efer ence in a single st at em ent . The New keyword inst ant iat es a SqlConnect ion obj ect . The argum ent for t he Connect ion obj ect specifies t he connect ion st ring for t he cur rent Windows user t o connect t o t he Nort hw ind dat abase on t he local default inst ance of SQL Ser ver on t he curr ent com put er . When r eferr ing t o t he local default inst ance, you can designat e t he Dat a Source as eit her ( local) or localhost . You can also designat e a ser ver s nam e inst ead of t he local one. For exam ple, y ou could ent er cab2000 as t he argum ent for Dat a Source if you could phy sically connect t o a SQL Ser ver inst ance nam ed cab2000. The serv er need not hav e t he .NET Fram ew ork inst alled j ust t he w orkst at ion running y our .NET applicat ion. The I nit ial Cat alog elem ent of t he Connect ionSt r ing argum ent specifies t he dat abase t o w hich y ou want t o open a connect ion. By set t ing t he I nt egrat ed Securit y elem ent of t he Connect ionSt r ing argum ent t o SSPI , y ou can designat e a connect ion based on t he curr ent Windows account . Aft er declar ing and inst ant iat ing cnn1, t he sam ple invokes t he Open m et hod for t he SqlConnect ion obj ect . Pr ov ided t he Nort hwind dat abase is available on t he local SQL Server inst ance and t he cur rent local user has perm ission t o access t he Nort hwind dat abase, t he Open m et hod succeeds. I f you ar e t he adm inist rat or of t he local ser ver and y ou per form ed a st andard inst allat ion of a r egular SQL Ser ver edit ion, t he Open m et hod w ill w or k. Aft er m ak ing t he connect ion, t he sam ple echoes t he connect ion st ring. The synt ax for ret ur ning t he connect ion st ring eit her t o t he Debug window in Visual St udio .NET or t o a m essage box is in t he sam ple. ( The m essage box way is com m ent ed out .) Before t erm inat ing, t he sam ple closes t he cnn1 SqlConnect ion obj ect . You should always explicit ly close SqlConnect ion obj ect s in y our applicat ions when y ou no longer need t hem .
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