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It reads the full list of CategoryNames from the Categories table and binds this information to a different list control. Initially, this list is hidden in a panel with its Visible property set to false. The code reveals the content of this panel by setting Visible to true. It highlights the row in the category list that corresponds to the current product. For example, if the current product is a Seafood category, the Seafood entry in the list box will be selected. This logic appears fairly involved, but it s really just an application of what you ve learned over the past two chapters. The full listing is as follows: protected void lstProduct_SelectedIndexChanged(object sender, EventArgs e) { // Create a command for selecting the matching product record. string selectProduct = "SELECT ProductName, QuantityPerUnit, " + "CategoryName FROM Products INNER JOIN Categories ON " + "Categories.CategoryID=Products.CategoryID " + "WHERE ProductID=@ProductID"; // Create the Connection and Command objects. SqlConnection con = new SqlConnection(connectionString); SqlCommand cmdProducts = new SqlCommand(selectProduct, con); // Retrieve the information for the selected product. using (con) { con.Open(); SqlDataReader reader = cmdProducts.ExecuteReader(); reader.Read(); // Update the display. lblRecordInfo.Text = "<b>Product:</b> " + reader["ProductName"] + "<br />"; lblRecordInfo.Text += "<b>Quantity:</b> " + reader["QuantityPerUnit"] + "<br />"; lblRecordInfo.Text += "<b>Category:</b> " + reader["CategoryName"]; // Store the corresponding CategoryName for future reference. string matchCategory = reader["CategoryName"].ToString(); // Close the reader. reader.Close(); // Create a new Command for selecting categories. string selectCategory = "SELECT CategoryName, " + "CategoryID FROM Categories"; SqlCommand cmdCategories = new SqlCommand(selectCategory, con); cmdProducts.Parameters.AddWithValue("@ProductID", lstProduct.SelectedItem.Value);

create create create create create create create create create create create create create create ...

// Retrieve the category information, and bind it. lstCategory.DataSource = cmdCategories.ExecuteReader(); lstCategory.DataTextField = "CategoryName"; lstCategory.DataValueField = "CategoryID"; lstCategory.DataBind(); // Highlight the matching category in the list. lstCategory.Items.FindByText(matchCategory).Selected = true; } pnlCategory.Visible = true; } You could improve this code in several ways. It probably makes the most sense to remove these data access routines from this event handler and put them into more generic functions. For example, you could use a function that accepts a ProductName and returns a single DataRow with the associated product information. Another improvement would be to use a stored procedure to retrieve this information. The end result is a window that updates itself dynamically whenever a new product is selected, as shown in Figure 16-10.

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Figure 16-10. Product information This example still has one more trick in store. If the user selects a different category and clicks Update, the change is made in the database. Of course, this means creating new Connection and Command objects, as follows:

app/controllers app/helpers app/models app/views/layouts config/environments components db doc lib lib/tasks log public/images public/javascripts

protected void cmdUpdate_Click(object sender, EventArgs e) { // Define the Command. string updateCommand = "UPDATE Products " + "SET CategoryID=@CategoryID WHERE ProductID=@ProductID"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(updateCommand, con); cmd.Parameters.AddWithValue("@CategoryID", lstCategory.SelectedItem.Value); cmd.Parameters.AddWithValue("@ProductID", lstProduct.SelectedItem.Value); // Perform the update. using (con) { con.Open(); cmd.ExecuteNonQuery(); } } You could easily extend this example so that it allows you to edit all the properties in a product record. But before you try that, you might want to experiment with the rich data controls that are shown in the next chapter. Using these controls, you can create sophisticated lists and grids that provide automatic features for selecting, editing, and deleting records.

1. Restore View 2. Apply Request Values 3. Process Validation 4. Update Model 5. Invoke Application 6. Render Response

In 15, you saw how to directly connect to a database, execute a query, loop through the records in the result set, and display them on a page. In this chapter, you ve already seen a simpler option with data binding, you can write your data access logic and then show the results in the page with no looping or control manipulation required. Now, it s time to introduce another convenience: data source controls. Amazingly enough, data source controls allow you to create data-bound pages without writing any data access code at all.

For this example, you ll use a project called Open Flash Chart. It s open source, unlike many other Flash charting components, so you can use it on any size project without paying licensing fees. Obtain Open Flash Chart from http://teethgrinder.co.uk/ open-flash-chart/. Unzip it into a temporary directory. Next, copy the open-flash-chart. swf file from the root of the ZIP file into a new directory into your Rails application: public/flash. You ll also use the Flash Object plug-in, which helps you include Flash objects in your views. Install this plug-in using the following command:

s Note As you ll soon see, often a gap exists between what you can do and what you should do. In most

professional applications, you ll need to write and fine-tune your data access code for optimum performance or access to specific features. That s why you ve spent so much time learning how ADO.NET works, rather than jumping straight to the data source controls.

The life cycle isn t set in stone; it s possible to skip certain phases based on what you re trying to do. Depending on exactly what you are focusing on (creating custom components, application development issues, and so on), you might concern yourself with only certain aspects of the life cycle.

ruby script/plugin install http://lipsiasoft.googlecode.com/svn/trunk/ flashobject_helper/

The data source controls include any control that implements the IDataSource interface. The .NET Framework includes the following data source controls:

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