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All three relationships are built in the same way in the AddRelationships() method, so you ll look at just one: the relationship between the Player and Manufacturer tables. The relationship between the tables is modeled using a DataRelation object and any constraints on the relationship by accessing either the ParentKeyConstraint or ChildKeyConstraint properties of the DataRelation. To establish a relationship, you need to create a new DataRelation object, specifying its name (ManufacturerToPlayer) and the parent and child columns that form the relationship: // create the Manufacturer to Player relationship DataRelation ManufacturerToPlayerRelation = new DataRelation( "ManufacturerToPlayer", dset.Tables["Manufacturer"].Columns["ManufacturerID"], dset.Tables["Player"].Columns["PlayerManufacturerID"]); Once the DataRelation object has been created, it can be added to the Relations collection using the Add() method: dset.Relations.Add(ManufacturerToPlayerRelation); Note that unlike all the Add() functions you ve seen in this section, this Add() method won t create a blank DataRelation for you to use. You must provide the related columns for the DataRelation to be created. With the relation established, you can set constraints on the parent or child column by assigning one to the ParentKeyConstraint or ChildKeyConstraint property, respectively. In this case, you need to establish a ForeignKeyConstraint on the child column. You need to block DELETE and UPDATE queries that would cause an orphan row in the Player table, like so: ForeignKeyConstraint ManufacturerToPlayerConstraint = ManufacturerToPlayerRelation.ChildKeyConstraint; ManufacturerToPlayerConstraint.DeleteRule = Rule.None; ManufacturerToPlayerConstraint.UpdateRule = Rule.None; Setting the DeleteRule and UpdateRule properties to Rule.None stops any deletions or updates to the Manufacturer table that would cause orphan rows in the Player table. And that s it. The rest of AddRelationships() essentially repeats this code to put the other two relationships in place.

You ll notice that the Register directive has a slightly different set of attributes than the directive you used for user controls. This Register directive identifies the compiled assembly file and the namespace that holds the custom control. When you register a custom control assembly in this fashion, you gain access to all the control classes in it. You can insert a control by using the tag prefix followed by a colon (:) and the class name. Here s what the control tag looks likes:

The IsPostBack is a property of the Page class. Let s see how it works by updating some BalloonShop classes in the following exercise.

Note The first time you drop a control from a class library onto a web page, Visual Studio copies the

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With each DataTable and the relationships between them established, all that s left is to add some data to the tables. You ve already seen how to use Fill() to fill tables, but that s not the only way to add information to a DataTable. You can also create and populate DataRow objects, adding them individually to the corresponding DataTable. The FillManufacturerTable() method demonstrates this.

library to your web application s Bin directory. From that point on, it will check for a newer version every time you compile the website and update the website by copying the latest control library automatically.

Figure 25-9 shows a simple page that allows you to test the NameTextBox control. It retrieves the first and last name entered in the text box when the user clicks a button.

1. Open the code-behind file of DepartmentsList and update its Page_Load method as shown here: // Load department details into the DataList protected void Page_Load(object sender, EventArgs e) { // don't reload data during postbacks if (!IsPostBack) { // CatalogAccess.GetDepartments returns a DataTable object containing // department data, which is read in the ItemTemplate of the DataList list.DataSource = CatalogAccess.GetDepartments(); // Needed to bind the data bound controls to the data source list.DataBind(); } } 2. Now, do the same in CategoriesList.ascx.cs: protected void Page_Load(object sender, EventArgs e) { // don't reload data during postbacks if (!IsPostBack) { // Obtain the ID of the selected department string departmentId = Request.QueryString["DepartmentID"]; // Continue only if DepartmentID exists in the query string if (departmentId != null) { // Catalog.GetCategoriesInDepartment returns a DataTable object // containing category data, which is displayed by the DataList list.DataSource = CatalogAccess.GetCategoriesInDepartment(departmentId); // Needed to bind the data bound controls to the data source list.DataBind(); // Make space for the next control brLabel.Text = "<br />"; } } }

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