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4. Add a Page_Load event handler to the page. First, add the code to populate the DataSet with the contents of the Manufacturer table. protected void Page_Load(object sender, EventArgs e) { // create the connection SqlConnection myConnection = new SqlConnection(); // create the DataSet object DataSet myDataSet = new DataSet(); // configure the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; myConnection.ConnectionString = strConnectionString; // create the command string strCommandText = "SELECT ManufacturerName, ManufacturerCountry, ManufacturerEmail, ManufacturerWebsite FROM Manufacturer ORDER BY ManufacturerName"; SqlCommand myCommand = new SqlCommand(strCommandText, myConnection); // create a DataAdapter SqlDataAdapter myAdapter = new SqlDataAdapter(); myAdapter.SelectCommand = myCommand; // populate the DataSet myAdapter.Fill(myDataSet, "Manufacturer"); 5. Add the following code that iterates through the DataTable containing the data and populates the Manufacturer objects: // now iterate through the rows in the table for (int i = 0; i <= myDataSet.Tables["Manufacturer"].Rows.Count - 1; i++) { Manufacturer objManufacturer = new Manufacturer(); objManufacturer.Name = Convert.ToString( myDataSet.Tables["Manufacturer"].Rows[i]["ManufacturerName"]); objManufacturer.Country = Convert.ToString( myDataSet.Tables["Manufacturer"].Rows[i]["ManufacturerCountry"]); objManufacturer.Email = Convert.ToString( myDataSet.Tables["Manufacturer"].Rows[i]["ManufacturerEmail"]); objManufacturer.Website = Convert.ToString( myDataSet.Tables["Manufacturer"].Rows[i]["ManufacturerWebsite"]);

You ve now finished implementing the search functionality of the catalog. Although you had quite a bit to write, the code wasn t that complicated, was it The single important detail of this exercise was calling the business tier CatalogAccess.Search method to get the search results and display them: // If performing a product search if (searchString != null) { // Retrieve AllWords from query string string allWords = Request.QueryString["AllWords"]; // Perform search list.DataSource = CatalogAccess.Search(searchString, allWords, page, out howManyPages); list.DataBind(); }

You can create a page that uses the LinkMenu2 control and add an event handler. Here s an example of an event handler that responds to clicks in the web page and displays a message in a label:

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Protected Sub cmdMoreInfo_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles cmdMoreInfo.Click If lstItems.SelectedIndex = -1 Then lblRecord.Text = "No item selected." Else ' Construct a key name based on the index. ' For example, Furniture1, Furniture2, and so on. Dim Key As String Key = "Furniture" & _ (lstItems.SelectedIndex + 1).ToString() ' Retrieve the Furniture object from session state. Dim Piece As Furniture = CType(Session(Key), Furniture) ' Display the information for this object. lblRecord.Text = "Name: " & Piece.Name lblRecord.Text &= "<br />Manufacturer: " lblRecord.Text &= Piece.Description lblRecord.Text &= "<br />Cost: $" & Piece.Cost.ToString() End If End Sub End Class

Label1.Text += objManufacturer.ToString() + "<BR/>"; } } 6. Save this code, and then run it. When the page loads, you ll see the same results as the previous example, as shown earlier in Figure 5-3.

Make sure to have a closer look at all the code that makes the product searching work. If you understand it correctly, you can easily update the code to make it work best for your particular solutions.

It s also a good practice to add a few session-friendly features in your application. For example, you could add a logout button to the page that automatically cancels a session using the Session.Abandon() method. This way, the user will be encouraged to terminate the session rather than just close the browser window, and the server memory will be reclaimed faster.

When web developers need to store a large amount of state information, they face a confounding problem. They can use session state and ensure excellent performance for a small set of users, but they risk poor scalability for large numbers. Alternatively, they can use a database to store temporary session information. This allows them to store a large amount of session information for a long time (potentially weeks or months instead of mere minutes). However, it also slows performance because the database must be queried for almost every page request. The compromise involves caching. The basic approach is to create a temporary database record with session information and store its unique ID in session state. This ensures that the in-memory session information is always minimal, but your web page code can easily find the corresponding session

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