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) Although both approaches have essentially the same footprint, they aren t the same for code management This is especially true in cases where you want to reuse the component in more than one web application (or even in different types of NET applications) If you use the App_Code approach with multiple web applications, it s all too easy to make slight modifications and wind up with a mess of different versions of the same shared class The second approach is also more practical for building large-scale applications with a team of developers, in which case you ll want the freedom to have different portions of the web application completed and compiled separately For these reasons, the class library approach is always preferred for professional applications..

1. How many arguments are there on this command line sa $# $(date "+%Y %m %d") John\ Doe 2. What potential problem exists with the following snippet year=$( date +%Y ) month=$( date +%m ) day=$( date +%d ) hour=$( date +%H ) minute=$( date +%M ) second=$( date +%S )

The App_Code subdirectory should be used only for classes that are tightly coupled to your web application. Reusable units of functionality (such as business libraries, database components, validation routines, encryption utilities, and so on) should always be built as separate class libraries. The scaled-down Visual Web Developer 2005 Express Edition doesn t provide support for class library projects.

get_filename(self, filename)

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The next example demonstrates a simple component that reads a random Sherlock Holmes quote from an XML file. (This XML file is available on the Internet and freely reusable via the GNU Public License.) The component consists of two classes a Quotation class that represents a single quote and a SherlockQuotes class that allows you to read a random quote. Both of these classes are placed in the SherlockLib namespace. The first listing shows the SherlockQuotes class, which loads an XML file containing quotes in QEL (Quotation Exchange Language, an XML dialect) when it s instantiated. The SherlockQuotes class provides a public GetRandom() quote method that the web-page code can use. using System; using System.Xml; namespace SherlockLib { public class SherlockQuotes { private XmlDocument quoteDoc; private int quoteCount; public SherlockQuotes(string fileName) { quoteDoc = new XmlDocument(); quoteDoc.Load(fileName); quoteCount = quoteDoc.DocumentElement.ChildNodes.Count; } public Quotation GetRandomQuote() { int i; Random x = new Random(); i = x.Next(quoteCount-1); return new Quotation( quoteDoc.DocumentElement.ChildNodes[i] ); } } } Each time a random quotation is obtained, it is stored in a Quotation object. The listing for the Quotation class is as follows: using System; using System.Xml; namespace SherlockLib { public class Quotation { private string qsource; public string Source { get {return qsource;} set {qsource = value;} } private string date; public string Date {

get {return date;} set {date = value;} } private string quotation; public string QuotationText { get {return quotation;} set {quotation = value;} } public Quotation(XmlNode quoteNode) { if ( (quoteNode.SelectSingleNode("source")) != null) qsource = quoteNode.SelectSingleNode("source").InnerText; if ( (quoteNode.Attributes.GetNamedItem("date")) != null) date = quoteNode.Attributes.GetNamedItem("date").Value; quotation = quoteNode.FirstChild.InnerText; } } }

The simplest way to quickly test this class is to copy the source code files to the App_Code subdirectory in a web application. You can take this step in Windows Explorer or use Visual Studio (Website Add Existing Item). Now you might want to import the SherlockLib namespace in your web page to make its classes more readily available, as shown here: using SherlockLib; Finally, you can use the class in your web-page code just as you would use a class from the .NET Framework. Here s an example that displays the quotation information on a web page: protected void Page_Load(object sender, System.EventArgs e) { // Put user code to initialize the page here. SherlockQuotes quotes = new SherlockQuotes(Server.MapPath("./sherlock-holmes.xml")); Quotation quote = quotes.GetRandomQuote(); Response.Write("<b>" + quote.Source + "</b> (<i>" + quote.Date + "</i>)"); Response.Write("<blockquote>" + quote.QuotationText + "</blockquote>"); } When you run this application, you ll see something like what s shown in Figure 5-8. Every time you refresh the page, you ll see a different quote.

When you use the App_Code directory, you face another limitation you can use only one language. This limitation results from the way that ASP.NET performs its dynamic compilation. Essentially, all the classes in the App_Code directory are compiled into a single directory, so you can t mix C# and VB.

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