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Chapter 14: LINQ 355TIPTry ThisThis single chapter about LINQ, a critically important new development in the .NETFramework 3.5, is the first step in a thousand-mile journey. You should be aware thatmore steps are available. In numerous blogs and online articles available from Microsoft,you can find some excellent and not-so-excellent discussions of LINQ. However, bewareof some of the initial materials on LINQ and Visual Studio 2008. Many articles online,while initially accurate, are no longer so because of changes in Visual Studio 2008 or inthe LINQ framework. At the time of this writing, several books are available where theauthors have ample room to go into all of the intense detail of LINQ. After reading thischapter, if you wish to find out more about LINQ for your projects, check out some ofthese books that lead to the rest of the steps in the LINQ journey.In a very fundamental way LINQ was designed to improve developer productivity.Because LINQ makes query statements more like standard language statements, developersare not sidetracked by incorporating a special flavor of SQL depending on the databasesystem. Likewise, built-in tools in ASP.NET 3.5, such as the LinqDataSource control, makedevelopment easier through several properties used in LINQ queries. The next sectionexamines how to use the controls in ASP.NET 3.5 to make queries as well as nonqueryoperations with LINQ.ASP.NET 3.5 and LINQTo see how to use the new LINQ control LinqDataSource, this example goes through arather lengthy Visual Studio 2008 process. However, once everything is done, you maybe surprised at how little ASP.NET code the process generates. Basically, the wholeoperation uses only two controls: LinqDataSource and DetailsView. If you are familiarwith the DetailsView control from ASP.NET 2.0, you will be happy to hear that the new3.5 version of control can use the LinqDataSource control as a data source. So while a lotof this will look new, the key display control is an old friend.Getting Started with LINQThis next set of steps to get you started requires Visual Studio 2008. If you are using oneof the Express versions of Visual Studio, be sure that any add-ons for LINQ are in place.Also, you will need to:1. Open a new Web Site, and name it ShowLinq.2. Open Solution Explorer and rename Default.aspx to ShowLinq.aspx.(continued)
356ASP.NET 3.5: A Beginner’s Guide3. Rename _Default to DoLinq in the C# script, and have it rename the ASP.NETinherit (inherits DoLinq).4. Right-click the App_Data folder and select Add New Item.5. Under Templates select SQL Server Database, and in the Name window changethe default name to ServiceReg.mdf as shown in Figure 14-1. Click the Add buttonwhen finished.6. Open the Server Explorer and you should see ServiceReg.mdf among the databases.Right-click the Tables folder icon, and select Add New Table as shown inFigure 14-2.7. When the table window opens, add the information shown in Figure 14-3. RegID isa primary key field and an identity field, so values enter automatically.8. Save the table using the name RegClients. You will see the table listed in the Tablesfolder of the ServiceReg.mdf database in the Server Explorer.Figure 14-1 Selecting SQL database
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ASP.NET 3.5A Beginner’s Guide
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ASP.NET 3.5A Beginner’s GuideWill
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This book is dedicated to Ricky, Ol
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Contents at a GlancePART I Getting
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For more information about this tit
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Contents xiUsing HTML Forms Interac
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Contents xiiiCREATE: The SQL Comman
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Contents xv17 ASP.NET Ajax . . . .
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AcknowledgmentsThis book was greatl
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IntroductionWhat distinguishes the
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Introduction xxiWhat This Book Cove
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Introduction xxiiiChapter 7: CSS fo
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Chapter 17: ASP.NET Ajax One of the
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Part IGetting StartedCopyright © 2
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Chapter 1Introduction toASP.NET 3.5
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Chapter 1: Introduction to ASP.NET
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Chapter 2ASP.NET 3.5 Toolsand Devel
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Chapter 3C# and ASP.NET 3.5Copyrigh
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Chapter 4Doing More withC# and ASP.
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Part IIForms and ControlsCopyright
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Chapter 5HTML Forms: A ReviewCopyri
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Chapter 6Standard Web ControlsCopyr
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Chapter 9Validation ControlsCopyrig
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Part IIIASP.NET and DatabasesCopyri
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Chapter 11A SQL PrimerCopyright ©
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Chapter 11: A SQL Primer 271the dat
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Chapter 11: A SQL Primer 275Specify
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Chapter 11: A SQL Primer 277ASP.NET
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Chapter 11: A SQL Primer 279Looking
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Chapter 12ADO.NET:Hello DatabaseCop
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Chapter 16: Security 405Figure 16-1
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Chapter 17ASP.NET AjaxCopyright ©
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Index< > (arrow brackets), 36Aacces
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Index 443ConVarASP.NET, 55C#, 56coo
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Index 445IntelliSense, 27and events
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Index 447StreamReader, 381StreamWri
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