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Web projects start with a single startup form, which you can design in much the same way as you design a web page For this example, you simply need to drag and drop a Button and a DataGridView control from the Toolbox Once again, begin by importing the namespace you need at the top of the form class file, as you did in the ASPNET page: using WindowsClientlocalhost; Next, add the event-handling code for the button This code retrieves the DataSet and displays it in the form Data binding works slightly differently in a Windows application; for example, you don t have to call an explicit DataBind() method after you set the data source This code also introduces one refinement it explicitly sets the application to use an hourglass cursor while the web service call is underway so the user knows that the operation is in progress.

Other than that, the code is identical: private void cmdGetData_Click(object sender, SystemEventArgs e) { thisCursor = CursorsWaitCursor; // Create the proxy EmployeesService proxy = new EmployeesService(); // Call the web service and get the results DataSet ds = proxyGetEmployees(); // Bind the results dataGridView1DataSource = dsTables[0]; thisCursor = CursorsDefault; } Figure 32-12 shows what you ll see when you run the Windows client and click the button to retrieve the web service data Of course, Windows development contains many other possibilities, which are covered in many other excellent books The interesting part from your vantage point is the way that a Windows client can interact with a web service just like an ASPNET application does This raises a world of new possibilities for integrated Windows and web applications.

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For example, you could extend this Windows application so that it allows the user to modify the employee data You could then add methods to the EmployeesService that allow the client to submit the changed data and commit the changes to the back-end database It s important to understand that what you do to consume your sample web service is exactly what you would do to consume any other third-party web service Web service providers don t need to distribute their proxy classes, because programming platforms such as NET include the tools to generate them automatically..

Ordinarily, referencing an attribute on an object accesses the attribute s value directly, without any complications. Getting and setting attributes directly affects the value in the object s instance namespace. Sometimes, additional work has to be done when accessing these values.

Once you ve retrieved all the data, you can loop through the records of the Categories table and add the name of each category to the HTML string: StringBuilder htmlStr = new StringBuilder(""); // Loop through the category records and build the HTML string. foreach (DataRow row in ds.Tables["Categories"].Rows) { htmlStr.Append("<b>"); htmlStr.Append(row["CategoryName"].ToString()); htmlStr.Append("</b><ul>"); ... Here s the interesting part. Inside this block, you can access the related product records for the current category by calling the DataRow.GetChildRows() method. Once you have this array of product records, you can loop through it using a nested foreach loop. This is far simpler than the code you d need in order to look up this information in a separate object or to execute multiple queries with traditional connection-based access. The following piece of code demonstrates this approach, retrieving the child records and completing the outer foreach loop: ... // Get the children (products) for this parent (category). DataRow[] childRows = row.GetChildRows(relat); // Loop through all the products in this category. foreach (DataRow childRow in childRows) { htmlStr.Append("<li>"); htmlStr.Append(childRow["ProductName"].ToString()); htmlStr.Append("</li>"); } htmlStr.Append("</ul>"); } The last step is to display the HTML string on the page: HtmlContent.Text = htmlStr.ToString(); The code for this example is now complete. If you run the page, you ll see the output shown in Figure 8-5.

A common question new ADO.NET programmers have is, when do you use JOIN queries and when do you Tip use DataRelation objects The most important consideration is whether you plan to update the retrieved data. If you do, using separate tables and a DataRelation object always offers the most flexibility. If not, you could use either approach, although the JOIN query may be more efficient because it involves only a single round-trip across the network, while the DataRelation approach often requires two to fill the separate tables.

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