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Figure 17-9. Editing a record The Cancel link returns the row to its initial state. The Update link passes the values to the SqlDataSource.UpdateParameters collection (using the field names) and then triggers the SqlDataSource.Update() method to apply the change to the database. Once again, you don t have to write any code, provided you ve filled in the UpdateCommand for the linked data source control. You can use a similar approach to add support for record deleting. To enable deleting, you need to add a column to the GridView that has the ShowDeleteButton property set to True. As long as your linked SqlDataSource has the DeleteCommand property filled in, these operations will work automatically. If you want to write your own code that plugs into this process (for example, updating a label to inform the user the update has been made), consider reacting to the GridView event that fires after an update operation is committed, such as RowDeleted

GetPathRoot()

> apt-get install apache2.2-common apache2-mpm-prefork \ > apache2-prefork-dev apache2-src apache2-utils autoconf \ > bison flex g++ libtool libxml2-dev re2c Once these packages are installed, you need to install the Unicode library ICU. At the time of this writing, the package-managed version of ICU is not compatible with PHP 6, so ICU 3.6 or higher must be manually installed. Fortunately, this installation is trivial: > > > > > > > > mkdir ~/icu3.6 cd ~/icu3.6 wget ftp://ftp.software.ibm.com/software/globalization/icu/3.6/icu4c-3_6-src.tgz tar xf icu4c-3_6-src.tgz cd icu/source mkdir /usr/local/icu ./configure --prefix=/usr/local/icu make && make install

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As a developer you ve probably already created classes or at least heard about them. Classes are the code definitions for objects. The nice thing about a class is that you can use it to create as many objects as you need. For example, you might have a class that represents an XML file, which can be used to read some data. If you want to access multiple XML files at once, you can create several instances of your class, as shown in Figure 3-1. These instances are called objects.

HasExtension() IsPathRooted()

Figure 3-1 Classes are used to create objects Classes interact with each other with the help of three key ingredients: Properties: Properties allow you to access an object s data Some properties may be readonly, so they cannot be modified, while others can be changed For example, the previous chapter demonstrated how you can use the read-only Length property of a string object to find out how many characters are in a string Methods: Methods allow you to perform an action on an object Unlike properties, methods are used for actions that perform a distinct task or may change the object s state significantly For example, to open a connection to a database, you might call the Open() method of a Connection object Events: Events provide notification that something has happened.

The Directory and File classes provide a number of useful static methods. Table 17-2 and Table 17-3 show an overview of the most important methods. Most of these methods take the same parameter: a fully qualified path name identifying the directory or file you want the operation to act on. A few methods, such as Delete() and Move(), take additional parameters. Table 17-2. Directory Class Members

If you ve ever programmed an ordinary desktop application in Visual Basic, you know how controls can fire events to trigger your code For example, if a user clicks a button, the Button object fires a Click event, which your code can react to ASPNET controls also provide events Classes contain their own code and internal set of private data Classes behave like black boxes, which means that when you use an object, you shouldn t waste any time wondering how it works internally or what low-level information it s using Instead, you need to worry only about the public interface of a class, which is the set of properties, methods, and events available for you to use Together, these elements are called class members In ASPNET, you ll create your own custom classes to represent individual web pages.

CreateDirectory()

After you ve completed the installation of ICU, installing PHP 6 is simple. First, find a copy of PHP 6 sourced from http://snaps.php.net or (once the final version is released) from http://www.php.net. The snapshot file should be called php6.0-200XXXXXXXX.tar.bz2. Use the following commands to install PHP 6: > > > > > tar xf php6.0-200XXXXXXXX.tar.bz2 cd php6.0-200XXXXXXXX ./configure \ --prefix=/usr/local/php6 --with-apxs2=/usr/bin/apxs2 \ --with-icu-dir=/usr/local/icu

In addition, you ll create custom classes if you design separate components For the most part, however, you ll be using prebuilt classes from the NET class library, rather than programming your own..

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