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<asp:ObjectDataSource ID="sourceCategories" runat="server" TypeName="DatabaseComponent.DBUtil" ... /> Once you ve attached the ObjectDataSource to a class, the next step is to point it to the methods it can use to select and update records. The ObjectDataSource defines SelectMethod, DeleteMethod, UpdateMethod, and InsertMethod properties that you use to link your data access class to various tasks. Each property takes the name of the method in the data access class. In this example, you simply need to enable querying, so you need to set the SelectMethod property so it calls the GetCategories() method: <asp:ObjectDataSource ID="sourceCategories" runat="server" TypeName="DatabaseComponent.DBUtil" SelectMethod="GetCategories" /> Once you ve set up the ObjectDataSource, you can bind your web page controls in the same way you do with the SqlDataSource. Here s the tag you need for the list box: <asp:DropDownList ID="lstCategories" runat="server" DataSourceID="sourceCategories" DataTextField="Name" DataValueField="ID"> </asp:DropDownList> This tag shows a list of category names (thanks to the DataTextField property) and also keeps track of the category ID (using the DataValueField property). This example works fine so far. You can run the test web page and see the list of categories in the list (as shown in Figure 23-9).

Figure 24-7. Renamed fields in the Table Mapping window Change field properties: Although this is too specialized for most developers, there are a number of details you can tweak using the Properties window, including the data type of each property, its default value, whether it has a fixed length, whether it allows nulls, and so on. Usually, these details are drawn from the database, but to supplement them, just right-click a field and choose Properties.

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The next step is to show the list of items in the current category in the GridView underneath. As with the SqlDataSource, the ObjectDataSource can be used only for a single query. That means you ll need to create a second ObjectDataSource that s able to retrieve the list of items by calling GetItems(). The trick here is that the GetItems() method requires a single parameter (named categoryID). That means you need to create an ObjectDataSource that includes a single parameter. You can use all the same types of parameters used with the SqlDataSource to get values from the query string, other controls, and so on. In this case, the category ID is provided by the SelectedValue property of the list box, so you can use a control parameter that points to this property. Here s the ObjectDataSource definition you need: <asp:ObjectDataSource ID="sourceItems" runat="server" SelectMethod="GetItems" TypeName="DatabaseComponent.DBUtil" > <SelectParameters> <asp:ControlParameter ControlID="lstCategories" Name="categoryID" PropertyName="SelectedValue" Type="Int32" /> </SelectParameters> </asp:ObjectDataSource> Again, you use the DBUtil class, but this time it s the GetItems() method you need. Even though there are two overloaded versions of the GetItems() method (one that takes a categoryID parameter and one that doesn t), you don t need to worry. The ObjectDataSource automatically uses the correct overload by looking at the parameters you ve defined.

At some point, you may need to add to your model or refresh it to take into account changes that have been made to the database. Fortunately, the Entity Framework makes this task easy. Just right-click anywhere in your model, and choose Update Model From Database. You ll see a dialog box named Update Wizard, even though it has just one step (Figure 24-8).

http://123.5.123.4/MyWebApp Because internal networks often use dynamic IP addresses, and DNS registration changes, using the computer name or domain name to access a website is almost always the best approach. If you study the URLs that the built-in web server in Visual Studio uses, you ll notice they re a little different than what you usually see when surfing the Internet. Namely, they include a port number. That means instead of requesting a page like this: http://localhost/MyWebApp/Default.aspx you might request a page like this: http://localhost:2040/MyWebApp/Default.aspx That s because the Visual Studio web server watches requests on a dynamically chosen port number. (In this example, the port number is 2040, but you ll see that it changes each time you run Visual Studio.) By using a dynamic port number, Visual Studio makes sure its built-in web server doesn t infringe on any other web server software you have on the computer. Real web servers are almost always configured to monitor port 80 (and port 443 for encrypted traffic). If you don t type in a port number for a URL, the browser assumes you re using port 80.

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