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The classes for retrieving file information and for reading and writing streams remain essentially the same in .NET 2.0, with a few useful additions. Here are the changes you ll see in this chapter, in their order of appearance: The DriveInfo class: Along with the existing DirectoryInfo and FileInfo classes, the DriveInfo class allows you to get information about a logical drive on the current computer. It s primarily useful for determining free and used space. The FileUpload control: FileUpload works almost the same as the HtmlInput control, allowing a user to upload files from a browser. It has one minor convenience it sets the encoding type of the <form> tag automatically, dodging a common mistake. Compression: The new System.IO.Compression namespace provides classes that let you compress data using the industry-standard GZIP algorithm.

Figure 12-15. Examining the DataSet XML The DataSet XML follows a predefined format with a few simple rules: The root document element is the DataSet.DataSetName (for example, Northwind). Each row in every table is contained in a separate element, using the name of the table. The example with one table means that there are multiple <Employees> elements. Every field in the row is contained as a separate tag in the table row tag. The value of the field is stored as text inside the tag. Unfortunately, the DataSet doesn t make it possible for you to alter the overall structure. If you need to convert the DataSet to another form of XML, you need to manipulate it by using XSLT or by loading it into an XmlDocument object.

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The Server Explorer provides a tree that allows you to explore various types of services on the current computer (and other servers on the network). It s similar to the Computer Management administrative tool. Typically, you ll use the Server Explorer to learn about available event logs, message queues, performance counters, system services, and SQL Server databases on your computer. The Server Explorer is particularly noteworthy because it doesn t just provide a way for you to browse server resources; it also allows you to interact with them. For example, you can create databases, execute queries, and write stored procedures using the Server Explorer in much the same way that you would using the Enterprise Manager administrative utility that s included with SQL Server. To find out what you can do with a given item, right-click it. Figure 2-13 shows the Server Explorer window listing the databases in a local SQL Server and allowing you to retrieve all the records in the selected table.

The simplest level of file access just involves retrieving information about existing files and directories and performing typical file system operations such as copying files and creating directories. These tasks don t involve actually opening or writing a file (both of which are tasks you ll learn about later in this chapter). The .NET Framework provides a few basic classes for retrieving file system information. They are all located in the System.IO namespace (and, incidentally, can be used in desktop applications in the same way they are used in web applications). They include the following:

Another option provided by the DataSet is the ability to access it through an XML interface. This allows you to perform XML-specific tasks (such as hunting for a tag or applying an XSL transformation) with the data you ve extracted from a database. To do so, you create an XmlDataDocument

Many of Visual Studio s most welcome enhancements appear when you start to write the code that supports your user interface. To start coding, you need to switch to the code-behind view. To switch back and forth, you can use two buttons that are placed just above the Solution Explorer window. The tooltips identify these buttons as View Code and View Designer. When you switch to code view, you ll see the page class for your web page. You ll learn more about code-behind later in this chapter. ASP.NET is event-driven, and everything in your web-page code takes place in response to an event. To create a simple event handler for the Button.Click event, double-click the button in design view. Here s a simple example that displays the current date and time in a label: protected void Button1_Click(object sender, EventArgs e) { Label1.Text = "Current time: " + DateTime.Now.ToLongTimeString(); }

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