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The Visitor pattern implementation is complete, but what isn t to our liking is the problem of having to associate XML attributes with the inspectees. Frankly, the current Visitor pattern implementation is both trivial and overkill. What would be of interest is to use the Visitor pattern to serialize an already existing type, without having to use XML attributes. It s possible to do this and relatively trivial to realize. For this example, the SampleClass used is from the earlier binary serialization example (the immutable SampleClass) minus the serializable attribute. The modified IVisitor implementation is defined as follows: public class VisitorImplementation : IVisitor { private string _path; public VisitorImplementation( string path) { _path = path; } public void Process< type>(type parameter) where type: class{ if( parameter is SampleClass) { XmlTextWriter writer = new XmlTextWriter( _path, null); SampleClass cls = parameter as SampleClass; writer.WriteStartDocument(); writer.WriteStartElement( "SampleClass"); writer.WriteStartElement( "Value"); writer.WriteString( XmlConvert.ToString( cls.Value)); writer.WriteEndElement(); writer.WriteStartElement( "Buffer"); writer.WriteString( cls.Buffer); writer.WriteEndElement(); writer.WriteEndElement(); writer.WriteEndDocument(); writer.Flush(); writer.Close(); } } } In the modified implementation of the method Process, instead of instantiating XmlSerializer, XmlTextWriter is instantiated. XmlTextWriter is a useful utility class that you can use to write an XML stream. An IVisitor implementation knows the details of the type being manipulated, and hence knows which data members exist. Therefore, it isn t difficult for IVisitor to manually convert the properties into a series of XML elements. The individual XML elements are serialized using the methods WriteStartDocument, WriteStartElement, and so on.

The developer and the DBA will work together on different pieces of the same puzzle The DBA will be visiting you, the developer, when your queries are consuming too many resources, and you will be visiting the DBA when you can t figure out how to make the system go any faster (that s when instance tuning can be done, when the application is fully tuned) This will all vary by environment, but I would like to think that there is a division A good developer is usually a very bad DBA, and vice versa They are two different skill sets, two different mind-sets, and two different personalities in my opinion..

i: 10,

Now press F5 to run your application and you should see an exciting screen like Figure 16-5:

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Even with this simple design, this application could scale out to handle additional load in the future. The requirements for what needs to be managed in state are minimal enough that they re easily implemented using cookies (good only for small amounts of data), and the database (more coding, but it s persistent, scalable, and available). Access to the database is synchronous, so any long-running queries would incur a delay in the responsiveness of the application for the user, as there s nothing in this design to address asynchronous operations. The recovery plan, should the server go down, is to drive to the office as fast as possible and repair or replace the machine. This results in a low availability guarantee, which is acceptable because the application isn t mission critical. Any requests in-process during a system crash would be lost. Deployment of new versions and fixes for this application are worry free. State information is tracked in the database, and correlated to users with a cookie value. Both of these stores survive the reboot of a web server. This architecture would obviously not work for all applications. There are a number of serious limitations. However, when the requirements are met by this solution, it s an excellent choice, because developing applications like these are extremely fast and very easy to learn, compared to a lot of n-tiered applications. We discuss strategies for reuse of code in the web presentation tier in 3. We cover using ADO.NET effectively in 10. And we examine the Data Access Layer Application block, a part of the Enterprise Library, in 11.

For the second NumericUpDown control, you must be sure to set the Maximum property before the Value property. Otherwise, the value of 1070 will exceed the default upper limit for the control. For the large TextBox on the right of the screen, change the ReadOnly property to True. This is where we are going to display the results of the calculations, and we don t want the user to be able to type text in this area. When you have configured these controls, your design surface should look like Figure 32-8.

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