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MANY PORTAL APPLICATIONS will have a business requirement to provide charting, reporting, or other analysis tools. These could be part of a sales forecasting system, a financial reporting tool, or a customer service application. In one possible architecture, basic functionality for accessing and modifying charts or reports could belong to a front-end portlet application, with an enterprise information system (EIS) on the back-end. In many cases, the EIS already exists, either as a custom-built application or as a packaged product. Packaged products may have charting, reporting, or analysis tools, although these may not be completely customizable or deployable in a portlet environment. If you are developing the EIS at the same time as the portlet application, you can design an API to enable data extraction for charting or reporting. Patching in a data access layer after the EIS is completed will probably be more complicated. In either case, creating a specification that defines the needed data and goals of the application will help create usable portlets. Sample charts are an easy way to define requirements for the application. By creating examples early in the process, developers and customers can set expectations for the project. Sometimes the charting tools will not be at the level needed for the sample charts. Knowing this ahead of time, developers can factor in additional development time for the project. Choosing a charting component that comes with source code is an efficient way to provide more business value for your customers and speed up your development. In this chapter, we use an open source product for charting named JFreeChart. Although many other commercial and open source charting products and tools are available, JFreeChart is widely used, has a large selection of charts, and is integrated into several reporting tools, such as Jasper Reports and JFreeReport.

private void button1_Click(object sender, EventArgs e) { Employee emp = new Employee(); EmployeeDetails ed= emp.GetEmployee(int.Parse(textBox1.Text)); label7.Text = ed.EmployeeID.ToString(); label8.Text = ed.FirstName; label9.Text = ed.LastName; label10.Text = ed.HomePhone; label11.Text = ed.Notes; } The Configure() method of the RemotingConfiguration class is called in the Load event handler of the form. This method is the same as the one we called in the console application. The code passes the full path of the client configuration file to the Configure() method. This call is needed just once and hence it has been put in the Load event and not in the Click event of the Show button. Inside the Click event handler of the Show button, a new instance of the Employee class is created. Then the GetEmployee() method of the Employee class is called by passing the supplied employee ID. The GetEmployee() method returns an object of type EmployeeDetails. The details such as EmployeeID, FirstName, LastName, HomePhone, and Notes are then displayed in labels.

JFreeChart is an open source Java library that you can use to create charts and graphs. The software package can be found at www.jfree.org/jfreechart/index.html. The library is licensed under the GNU Lesser Public License. We are using version 0.9.17 for the examples in this chapter. You will need the JFreeChart JAR

I ve mentioned view state a couple of times in this chapter, but what is it And what does it do for you Typically, web applications are stateless. Normally when we think of a stateless web application, we re thinking of an application that doesn t correlate invocations of the various pages in the application. Conversely, if you visit an online store and place an item in your shopping cart, you expect that item to be available in your shopping cart for checkout. This is known as session state. But there is another type of stateless behavior going on here the server will lose the page s control information between postbacks unless we do something about it. From HTML s inception, servers (for performance reasons) throw control values away when pages are posted back. To do otherwise typically consumes resources on the server and dramatically affects the scalability of the application. And as we saw earlier, even in the simplest of applications adding two numbers statelessness drastically affects the usability of the application because of this. A number of methods, such as cookies, could be used to maintain state on a page, but they can lead to security problems and privacy issues. Additionally, cookie use often requires a lot of development overhead, particularly for sophisticated applications. .NET has introduced the concept of view state to overcome these problems while ASP .NET page, you also minimizing the impact on the developer. When you define an ASP

Note If you look at the code that consumes the remote server, you won t find anything different. This is

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