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form, URL, session, and cookie variables will be made into global variables, which is generally a bad thing. The problem is that for many years the default was to have this setting enabled, so some web servers will have it enabled while others won t. All code in this book will work with register_globals turned off, just as all code you develop should (unless there s a particular reason to do otherwise). The same applies to the magic_quotes_gpc setting, which is used to automatically escape submitted data. While it is not necessarily a bad thing in general, all the code we develop will escape data as required; this setting should not be relied upon and is therefore disabled.

When the page is first loaded, it calls GetDataSet() to retrieve the DataSet. It then gets the DataTable with the customer records, and binds the DataTable.Columns collection to a CheckBoxList control named chkColumns: protected void Page_Load(object sender, EventArgs e) { if (!this.IsPostBack) { DataSet ds = GetDataSet(); chkColumns.DataSource = ds.Tables["Customers"].Columns; chkColumns.DataTextField = "ColumnName"; chkColumns.DataBind(); } } As you learned in 15, the DataTable.Columns collection holds one DataColumn object for each column in the DataTable. Each DataColumn specifies details such as data type and column name. In this example, the DataColumn.ColumnName property is used to display the name of each column (as configured by the DataTextField property of the CheckBoxList control). Every time the Filter button is clicked, the page calls GetDataSet() to retrieve the DataSet. To provide the configurable grid, the code loops through the DataTable, removing all the columns that the user has selected to hide. The code then binds the data by calling GridView.DataBind(). The full code for the Filter button is as follows: protected void cmdFilter_Click(Object sender, EventArgs e) { DataSet ds = GetDataSet(); // Copy the DataSet so you can remove columns without // changing the cached item. ds = ds.Copy(); foreach (ListItem item in chkColumns.Items) { if (item.Selected) { ds.Tables[0].Columns.Remove(item.Text); } } gridCustomers.DataSource = ds.Tables[0]; gridCustomers.DataBind(); } This example demonstrates an important fact about the cache. When you retrieve an item, you actually retrieve a reference to the cached object. If you modify that object, you re

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In short, ADO.NET is a lot better than ADO ever was, and it s part of the .NET Framework, which provides a number of development benefits. Developing data-driven Web sites has never been so straightforward. The first release of the ASP.NET made writing data-aware pages almost idiot-proof, and with ASP.NET 2.0, it has become almost child s play. I say almost because data access is the one area where you re guaranteed to make mistakes when developing your Web site. Although ASP.NET 2.0 makes developing data-aware Web sites a lot safer, it s still possible to make mistakes.

actually modifying the cached item as well. For the page to be able to delete columns without affecting the cached copy of the DataSet, the code needs to create a duplicate copy before performing the operations using the DataSet.Copy() method.

/designingcontent.html, you can specify a style sheet specifically for the Apple iPhone by using the only keyword in combination with the screen media type. Other devices will ignore the only keyword and therefore not use the style sheet. For example, to load the iphone.css file only for people viewing on an iPhone you can use <link rel="stylesheet" href="iphone.css" type="text/css" media="only screen and (max-device-width: 480px)" />.

The SqlDataSource ( 16), ObjectDataSource ( 23), and XmlDataSource ( 19) all support built-in data caching. Using caching with these controls is highly recommended, because unlike your own custom data code, the data source controls always requery the data source in every postback. They also query the data source once for every bound control, so if you have three controls bound to the same data source, three separate queries are executed against the database just before the page is rendered. Even a little caching can reduce this overhead dramatically.

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