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HP 6 is a major upgrade to the PHP language. The core focus for PHP 6 is native Unicode support, which will allow you to seamlessly use multiple languages within your applications. Programmers in non-English-speaking countries will even be able to name their functions and classes in their own native language. Unicode support is quickly becoming extremely important, as more and more of your applications will be targeting users worldwide. Beyond multilanguage support, PHP 6 also adds some advanced OOP concepts, such as namespaces and late static binding. If properly used, these features will allow you to better organize your classes and methods. PHP 6 also serves as a chance to break some backward-compatibility and clean up existing functions. You will find support for register_globals, magic_quotes_gpc, and safe_mode removed, along with the PHP 4 ze1 compatibility mode. The parameter ordering of a few functions has also been updated to make the API more consistent. Finally, PHP 6 includes several new classes like XMLWriter, which add new functionality to the PHP language.

The GridView provides built-in support for selection. You simply need to add a CommandField column with the ShowSelectButton property set to True. ASP.NET can render the CommandField as a hyperlink, a button, or a fixed image. You choose the type using the ButtonType property. You can then specify the text through the SelectText property or specify the link to the image through the SelectImageUrl property. Here s an example that displays a select button: <asp:CommandField ShowSelectButton="True" ButtonType="Button" SelectText="Select" /> And here s an example that shows a small clickable icon: <asp:CommandField ShowSelectButton="True" ButtonType="Image" SelectImageUrl="select.gif" /> Figure 17-6 shows a page with a text select button (and product 14 selected). When you click a select button, the page is posted back, and a series of steps unfolds. First, the GridView.SelectedIndexChanging event fires, which you can intercept to cancel the operation. Next, the GridView.SelectedIndex property is adjusted to point to the selected row. Finally, the GridView.SelectedIndexChanged event fires, which you can handle if you want to manually update other controls to reflect the new selection. When the page is rendered, the selected row is given the selected row style.

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Along with the five classes outlined in the previous section, .NET also includes a helper class named Path in the same System.IO namespace. The Path class doesn t include any real file management functionality. It simply provides a few static methods that are useful when manipulating strings that contain file and directory paths. For example, the Path class includes a GetFileName() method that pulls the file name out of a full string. Here s an example: string file = Path.GetFileName( @"c:\Documents\Upload\Users\JamesX\resume.doc"); // file now contains "resume.doc"

Tip Rather than add the select button yourself, you can choose Enable Selection from the GridView s smart

In C#, you need to take special care when creating strings that hold file paths or directory paths. That s because in C#, the directory separation character (\) also has another meaning it indicates the start of a special character sequence. To indicate that you really want a backward slash and not a special character sequence, you need two slashes, as shown here:

string myDirectory = "c:\\Temp\\MyFiles";

You don t need to create a new column to support row selection. Instead, you can turn an existing column into a link. This technique is commonly implemented to allow users to select rows in a table by the unique ID value. To use this technique, remove the CommandField column, and add a ButtonField column instead. Then, set the DataTextField to the name of the field you want to use. <asp:ButtonField ButtonType="Button" DataTextField="ProductID" /> This field will be underlined and turned into a button that, when clicked, will post back the page and trigger the GridView.RowCommand event. You could handle this event, determine which row has been clicked, and programmatically set the SelectedIndex property of the GridView. However, you can use an easier method. Instead, just configure the link to raise the SelectedIndexChanged event by specifying a CommandName with the text Select, as shown here: <asp:ButtonField CommandName="Select" ButtonType="Button" DataTextField="ProductID" /> Now clicking the data field automatically selects the record.

Note In tracking any open source project, it is often hard to predict how the language will evolve. This

Another option is to precede your string with the at sign (@). This tells C# to interpret the string exactly as written. Here s an example of this syntax:

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