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Listing 10-28. Saving a DataSet as a DiffGram private void button2_Click(object sender, EventArgs e) { StreamWriter writer=File.CreateText(Application.StartupPath + @"\employees.xml"); ds.WriteXml(writer, XmlWriteMode.DiffGram); writer.Close(); } The code calls the WriteXml() method of DataSet to save its contents to an XML file (Employees.xml). The XmlWriteMode parameter of WriteXml() indicates that DiffGram format is to be used while writing the data. This DiffGram is executed against the database when you click the Update DiffGram button. The Click event handler of the Update DiffGram button is shown in Listing 10-29. Listing 10-29. Updating a DiffGram in a Database private void button1_Click(object sender, EventArgs e) { StreamReader reader = File.OpenText(Application.StartupPath + @"\employees.xml"); SqlXmlCommand cmd = new SqlXmlCommand(strConn); cmd.CommandType = SqlXmlCommandType.DiffGram; cmd.CommandText = reader.ReadToEnd(); cmd.SchemaPath = Application.StartupPath + @"\employees.xsd"; cmd.ExecuteNonQuery(); MessageBox.Show("DiffGram updated to database successfully!"); } The code opens the Employees.xml file in a StreamReader object. It then creates an instance of the SqlXmlCommand class and sets the CommandType property of the SqlXmlCommand instance to DiffGram. This is how you tell SqlXmlCommand about your intention to update a DiffGram. When the CommandType is DiffGram, the CommandText property must contain the DiffGram itself. The ReadToEnd() method of StreamReader reads the complete DiffGram and assigns it to the CommandText property. If you wish to update the database by using the DiffGram method, you must specify the SchemaPath property also. In this case, the schema is the same as we created in Listing 10-21 earlier. Finally, the ExecuteNonQuery() method of the SqlXmlCommand is called to save all the changes to the database. The ExecuteNonQuery() method is used for executing queries that do not return anything. In our example, we simply want to update the DiffGram to the database and hence we used the ExecuteNonQuery() method.

A portlet application can track the user across multiple client requests for a portal page using sessions. Session tracking for portlets is similar to the session tracking used in the servlet API. For portlets, the portal is responsible for the mechanics of maintaining a session for the user across HTTP (which is a stateless protocol). The portal s session tracking could be done with HTTP cookies, URL rewriting, or another mechanism, but the portlet should not rely on or expect any particular method. A portlet in a portlet application can get access to the session through a PortletSession object. The PortletSession object is available through the portlet s request object. There are two getPortletSession() methods on the PortletRequest object used for retrieving portlets. You use the first method to access the portlet session for the user, if one already exists. If the user s session has not been created yet, this method will create the new session and return it:

Summary

public PortletSession getPortletSession ()

Whenever XmlTextReader parses any XML file, it creates a list of element names found in that document. This list is called a name table. Imagine that you are parsing dozens of separate files that have the same structure as that of Employees.xml. That means the XmlTextReader class needs to generate the same name table again and again. You can improve the efficiency of this process by supplying a ready-made name table, represented by the XmlNameTable class, for further parsing. The XmlNameTable class is an abstract class, but the .NET Framework provides a class called NameTable that inherits from it. You can therefore use this NameTable class in your code. The code fragment in Listing 3-3 will make the use of name tables clear. Listing 3-3. Using Name Tables NameTable table = new NameTable(); XmlTextReader reader1 = new XmlTextReader(Application.StartupPath + @"\employees1.xml",table); XmlTextReader reader2 = new XmlTextReader(Application.StartupPath + @"\employees2.xml",table); XmlTextReader reader3 = new XmlTextReader(Application.StartupPath + @"\employees3.xml",table); //process further

WF is a powerful and flexible design and runtime environment that allows you to encapsulate your business processes into a visual design and then compile and implement that design into a working program. This can come in particularly handy for web development, where you can neatly bundle up some very sophisticated functionality behind redistributable libraries or hosted, sharable web services. As you design your web appli-

PortletSession object:

The code creates a new instance of the NameTable class, which will naturally be empty. Then an instance of XmlTextReader is created. This time the constructor takes two parameters: a filename and a NameTable. When you read the XML document for the first time, that is, using reader1, the supplied NameTable instance is populated. That means we have a NameTable ready for use. The same NameTable is supplied as a parameter to reader2 and reader3; they will in turn use this ready-made NameTable, thus improving the efficiency of the code.

public PortletSession getPortletSession (boolean create)

cation infrastructure, it s a good idea to start thinking about it in terms of workflow and if complex systems and interactions can be designed as a workflow, you may save yourself and your company a lot of time and money by implementing it in WF. As such, WF, as one of the foundations of .NET 3.0, has a well-deserved place in the architecture of the future Web, and is a resource well worth learning and understanding. The simple applications that you learned in this chapter are but a taste of what is possible with WF. If you want to learn more about WF, a terrific resource to begin with is Microsoft Windows Workflow Foundation Step by Step, by Kenn Scribner (Microsoft Press, 2007).