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However, the Repeater doesn t really understand anything, so it simply puts each item template one directly after another, and you can t see where one row ends and the next one begins You can define several kinds of row templates for the DataList and Repeater, and we ll get to them in a minute The basic one is the ItemTemplate, as shown here You can think of each template as a mini-page where you can place any combination of text, HTML, Web controls, and, most important, instructions on how and where to bind the columns in the data source in that row When the call to DataBind() is made (either directly in code or automatically as part of the page life cycle), the mini-page template is repeated for each row in the data The ItemTemplate in the example is simple.

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

Summary

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:

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It declares that each row will contain five Label controls, one for each column in the Player table To associate a column in the data with the Label, you inline-bind it with the following binding expression: <%# DataBinderEval(Container, "DataItemPlayerID") %> You saw the static DataBinderEval method when we looked at inline binding in the previous chapter The first parameter locates the data source, and the second locates the column that will be bound Container in this case means that the data source is the container for this template, or, rather, the DataList or Repeater You can use this nomenclature in any template As you may have noticed, a row corresponds to an item here, and you can refer to the column you want by name through the DataItem object.

<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>

You ve done a lot of coding in this chapter. You implemented five user controls, along with their middle-tier methods and stored procedures for the data tier. You learned how to implement a simple authentication scheme so only administrators are allowed to access the catalog administration page. You made contact with the GridView, which is probably the most powerful web control that comes packaged with the .NET Framework. You learned how to use GridView s built-in features for editing, selecting, updating, and deleting records. You also learned how to use template columns to improve its functionality. At the end of the chapter, you learned how to upload files from the client to the server using ASP.NET.

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. In this case, you use a single parameter that extracts the selected category ID from the list box and passes it to the GetItems() method. Notice that the name defined in the ControlParameter tag matches the parameter name of the GetItems() method. This is an absolute requirement. The ObjectDataSource searches for the GetItems() method using reflection, and it verifies that any potential match has the number of parameters, parameter names, and data types that you ve indicated. This searching process allows the ObjectDataSource to distinguish between different overloaded versions of the same method. If the ObjectDataSource can t find the method you ve specified, an exception is raised at this point.

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