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Listing 13-3 shows the Click event handler of the Show button that groups the data based on the selected field. Listing 13-3. Grouping Data Using LINQ private void button1_Click(object sender, EventArgs e) { txtResults.Clear(); if (comboBox1.SelectedItem.ToString() == "Country") { var result = from employee in employees group employee by employee.Country; foreach (var group in result) { OutputResults("Group :" + group.Key); foreach (Employee emp in group) { OutputResults(emp); } } } ... } The code first decides which field is to be used for the purpose of grouping (we see the code that deals with the country field here). Then it forms a LINQ query expression that groups the items from the List based on that field. Notice the use of C# language extensions to LINQ in the form of the var, from, and group keywords. When you work with LINQ, the return type of

2

"http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> <display-name>Advanced Portlet</display-name> <description>An advanced portlet.</description> </web-app>

Before we go into the architecture of ASP.NET, it s a good idea to create a simple ASP.NET application that can be used to demonstrate its architectural principles. This application is a multiple-tier application that consumes a back-end web service to expose a stock quote to the user. The examples in this chapter are built using Visual Web Developer Express (VWDE), downloadable for free from Microsoft at http://msdn.microsoft.com/ vstudio/express/vwd/. (For those who are not familiar with Visual Studio, we will look into the different versions available in a little more detail later in this chapter.) This section assumes that you aren t familiar with building ASP.NET applications, so we will follow the process in small steps.

the queries is often unknown at the time of writing the query. To indicate such an anonymous type, C# uses the var keyword. The LINQ query that follows indicates that you want to fetch all the items from the employees collection and want to group them by Country values. At run time, this LINQ query returns a dictionary. The outer foreach loop iterates through all the items of this dictionary. With each iteration, the key of the dictionary item is outputted in the TextBox using the OutputResults() helper method (discussed next). The inner foreach loop iterates through all the employees from a group and emits their details in the TextBox. Listing 13-3 shows the code only for the Country field, but the other fields will follow the same structure. The OutputResults() helper method has two overloads as shown in Listing 13-4. Listing 13-4. Outputting Results to a TextBox private void OutputResults(Employee emp) { txtResults.Text += "[" + emp.EmployeeID + "] "; txtResults.Text += emp.FirstName + " " + emp.LastName + "(" + emp.BirthDate.ToShortDateString() + ")," + emp.Country + "\r\n"; } private void OutputResults(string msg) { txtResults.Text += msg + "\r\n"; } The first overload of the OutputResults() helper method accepts an Employee object and appends its property values to the TextBox contents. The second overload simply accepts a string value and appends it to the TextBox contents.

We packaged the advanced portlet the same way we packaged the first portlet. We also deployed the advanced portlet with the same deployment tool and command line, substituting our new WAR file s path. You will need to add the new portlet application to the portletentityregistry.xml file that we edited for the first portlet. With both portlet applications, it should look like this:

VWDE enables you to create web site applications that run on either the Visual Studio 2005 Web Server (also known as Cassini), which comes with Visual Studio, or from Internet Information Services (IIS). The first example will use Cassini.

Now let s implement the sorting functionality. The sorting operation is done in the Click event handler of the second Show button. The part of the event handler is shown in Listing 13-5. Listing 13-5. Sorting Data Using LINQ private void button2_Click(object sender, EventArgs e) { txtResults.Clear(); if (comboBox2.SelectedItem.ToString() == "Country") { var result = from employee in employees orderby employee.Country select employee;

< xml version="1.0" encoding="UTF-8" > <portlet-entity-registry> <application id="first"> <definition-id>first</definition-id> <portlet id="firstportlet"> <definition-id>first.FirstPortlet</definition-id> </portlet> </application> <application id="advanced"> <definition-id>advanced</definition-id> <portlet id="advancedportlet"> <definition-id>advanced.AdvancedPortlet</definition-id> </portlet> </application> </portlet-entity-registry>

s Note When running Visual Studio in Windows Vista, if you want to debug your application you should run

We also added the advanced portlet to the pageregistry.xml file. The portal will display the first portlet side by side with the advanced portlet: