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The way we determine whether an error has occurred is to check the $error variable passed to this template (when called in register.tpl). If it is an empty string, there are no errors. Otherwise FormProcessor::getError() will return a single error as a nonempty string, and multiple error messages with the same name will be returned as an array. The other significant thing to notice in this template is that we still generate the HTML div even if there is no error. We do this to create a placeholder for error messages we might generate on the client side using JavaScript. Later in this book we will add some client-side validation to this form (such as checking the availability of a username in real time), so we will write error messages to this error container.

.NET provides a rich set of classes for XML manipulation in several namespaces that start with System.Xml. One of the most confusing aspects of using XML with .NET is deciding which combination of classes you should use. Many of them provide similar functionality in a slightly different way, optimized for specific scenarios or for compatibility with specific standards. The majority of the examples you ll explore use the types in the core System.Xml namespace. The classes here allow you to read and write XML files, manipulate XML data in memory, and even validate XML documents. In this chapter, you ll look at the following options for dealing with XML data: Reading and writing XML directly, just like you read and write text files using XmlTextWriter and XmlTextReader Dealing with XML as a collection of in-memory objects, such as XmlDocument and XmlNode Binding to the XmlDataSource to display XML information with minimum fuss In addition, you ll get a preview of three more ways to manipulate XML in the Still More Ways to Read XML sidebar at the end of this chapter.

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One of the simplest ways to create or read any XML document is to use the basic XmlTextWriter and XmlTextReader classes. These classes work like their StreamWriter and StreamReader relatives, except that they write and read XML documents instead of ordinary text files. This means you follow the same process you saw in 18 for creating a file. First, you create or open the file. Then, you write to it or read from it, moving from top to bottom. Finally, you close it and get to work using the retrieved data in whatever way you d like. Before beginning this example, you ll need to import the namespaces for file handling and XML processing: using System.IO; using System.Xml; Here s an example that creates a simple version of the SuperProProductList document: // Place the file in the App_Data subfolder of the current website. // The System.IO.Path class makes it easy to build the full file name. string file = Path.Combine(Request.PhysicalApplicationPath, @"App_Data\SuperProProductList.xml");

At this stage in the development of the registration form, if you were to click the submit button, nothing would happen other than the empty form being redisplayed. When the page reloads, the register action handler should process the request by either using the FormProcessor_ UserRegistration class to check the form and save the user data, or to simply display the form.

DataType: integer PrimaryKey: true Not Null: true DataType: integer PrimaryKey: true Not Null: true

FileStream fs = new FileStream(file, FileMode.Create); XmlTextWriter w = new XmlTextWriter(fs, null); w.WriteStartDocument(); w.WriteStartElement("SuperProProductList"); w.WriteComment("This file generated by the XmlTextWriter class."); // Write the first product. w.WriteStartElement("Product"); w.WriteAttributeString("ID", "1"); w.WriteAttributeString("Name", "Chair"); w.WriteStartElement("Price"); w.WriteString("49.33"); w.WriteEndElement(); w.WriteEndElement(); // Write the second product. w.WriteStartElement("Product"); w.WriteAttributeString("ID", "2"); w.WriteAttributeString("Name", "Car"); w.WriteStartElement("Price"); w.WriteString("43399.55"); w.WriteEndElement(); w.WriteEndElement(); // Write the third product. w.WriteStartElement("Product"); w.WriteAttributeString("ID", "3"); w.WriteAttributeString("Name", "Fresh Fruit Basket"); w.WriteStartElement("Price"); w.WriteString("49.99"); w.WriteEndElement(); w.WriteEndElement(); // Close the root element. w.WriteEndElement(); w.WriteEndDocument(); w.Close(); This code is similar to the code used for writing a basic text file. It does have a few advantages, however. You can close elements quickly and accurately, the angle brackets (< >) are

Note If an error occurs while processing the form (such as the user entering a username already in use),

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included for you automatically, and some errors (such as closing the root element too soon) are caught automatically, thereby ensuring a well-formed XML document as the final result. To check that your code worked, open the file in Internet Explorer, which automatically provides a collapsible view for XML documents (see Figure 19-1).

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