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You propagate the changes to the database by calling the Update() method of the DataAdapter specifying the DataSet and the name of the DataTable you want to update. Then you inform the user that the save was successful: // now update the database myAdapter.Update(myDataSet, "Manufacturer"); // show the result QueryResult.Text = "Save of manufacturer was successful"; Although the code looks simple, quite a lot of work is going on under the covers. The DataAdapter loops through all of the DataRows in the DataTable and checks the RowStatus. If the

When working with web controls, it s often useful to use a three-letter lowercase prefix to identify the type of control. The preceding example (and those in the rest of this book) follows this convention to make user interface code as clear as possible. Some recommended control prefixes are as follows: Button: cmd CheckBox: chk Image: img Label: lbl List control: lst Panel: pnl RadioButton: opt TextBox: txt If you re a veteran programmer, you ll also notice that this book doesn t use prefixes to identify data types. This is in keeping with the new philosophy of .NET, which recognizes that data types can often change freely and without consequence and that variables often point to full-featured objects instead of simple data variables.

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This chapter presented a high-level overview that gave you your first taste of ASP .NET and the .NET Framework. You also looked at how web development has evolved, from the basic HTML forms standard to the latest changes in .NET 3.5. In the next chapter, you ll get a comprehensive overview of the C# language.

Our next step is to include the database connection code in our index.php file there are two key additions we must make. The first is to fetch the connection values from $config instead of hard-coding them. The second is to write the $db object to the Zend_Registry so we can use it throughout our application. Listing 2-10 shows the updated index.php file, this time connecting to the database and writing the $db object to the registry. Listing 2-10. The index.php File, Now Connecting to the Application Database (index.php) < php require_once('Zend/Loader.php'); Zend_Loader::registerAutoload();

status is Added, Modified, or Deleted, the changes are propagated back to the database using the InsertCommand, UpdateCommand, or DeleteCommand, respectively As you ve made only one change the DataTable, you have only one change to propagate to the database As it s a DataRow addition, the InsertCommand will be used The CommandBuilder created the InsertCommand automatically, and as you saw in the example, it works It s not all magic though, and it is possible to view the query that is being executed by tapping into the events that the DataAdapter raises As in common with most of the other data-access Web controls and classes in ASPNET, the DataAdapter has before and after events concerned with updating the database: RowUpdating: This event occurs before the update takes place The event arguments allow you to inspect the query that is being executed.

efore you can create an ASP .NET application, you need to choose a .NET language in which to program it. If you re an ASP or VB developer, the natural choice is VB 2008. If you re a longtime Java programmer or old-hand C coder, or you just want to learn the official language of .NET, C# will suit you best. This chapter presents an overview of the C# language. You ll learn about the data types you can use, the operations you can perform, and the code you ll need to define functions, loops, and conditional logic. This chapter assumes you ve programmed before and you re already familiar with most of these concepts you just need to see how they re implemented in C#. If you ve programmed with a similar language such as Java, you might find that the most beneficial way to use this chapter is to browse through it without reading every section. This approach will give you a general overview of the C# language. You can then return to this chapter later as a reference when needed. But remember, though you can program an ASP.NET application without mastering all the language details, this deep knowledge is often what separates the casual programmer from the legendary programming guru.

s Note The examples in this chapter show individual lines and code snippets. You won t actually be able

// load the application configuration $config = new Zend_Config_Ini('../settings.ini', 'development'); Zend_Registry::set('config', $config);

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