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Chapter 12: ADO.NET: Hello Database 309Figure 12-16 Output from data reader application shows added record.Figure 12-17 Table data showing new record
310ASP.NET 3.5: A Beginner’s GuideIn looking at Figure 12-17, you can see that the SupID is automatically added eventhough there is no parameter in the code that adds a value to that field. Now you can restassured that the SQL statement in the C# code performed as expected.Dynamic Data EntryThe example application showed how to format a SQL command to insert data into a table.However, it is not a very practical application because the values are nondynamic. What youneed is some way for the data entered using web controls to be passed on to the database.The trick is to work out how to pass values from ASP.NET web controls or othersources to the values placed in the database table. Fortunately, a simple SqlCommandprovides an easy way to do this. It has the following format where sqlCmd is the instanceof the SqlCommand:sqlCmd.Parameters.Add("@ValueName", Source);The first parameter is the name of a placeholder that is used in the VALUE parameter, andthe second is the source of the data that contains the values to be passed. For example, thefollowing C# line of code uses the web control (a TextBox) named LName.Text as thesource of data for the placeholder named @LName.sqlCmd.Parameters.Add("@LName", LName.Text);You do not have to use a web control or a value from the ASP.NET portion of yourapplication. You can generate values using C# by using either calculated outcomes fromASP.NET controls or built-in objects such as the DateTime class. For example, thecurrentDate (second parameter) is based on the DateTime.Now property’s value:sqlCmd.Parameters.Add("@NowDate", currentDate);Once the parameters have been added, they can be passed to the selected table in the sameway as are literals.To see how to use dynamic entry of data through an ASP.NET front-end, the followingapplication uses the VoteNow database and Supporters table. However, instead of hardcodingvalues into the program, everything is handled either automatically or dynamicallythrough user input.ASP.NET DynamicEntry.aspx
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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 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 9Validation ControlsCopyrig
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Chapter 14: LINQ 365As you can see,
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Chapter 15FilesCopyright © 2009 by
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Chapter 15: Files 373The bulk of th
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Chapter 16SecurityCopyright © 2009
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Chapter 16: Security 391certain peo
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Chapter 16: Security 395ASP.NET Log
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Chapter 16: Security 397Figure 16-4
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Chapter 16: Security 413Next, you n
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Chapter 17ASP.NET AjaxCopyright ©
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Chapter 17: ASP.NET Ajax 439Summary
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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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