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An ADO.NET object that we mentioned earlier but haven t examined so far is the DataSet. Unlike the data reader, command, and connection objects that we ve been using, DataSet objects are not data provider-dependent. DataSet is a class in the System.Data namespace, and instances of it can be used with any data source. A DataSet object can be thought of as an in-memory relational database, as it contains a collection of DataTable objects, which, in turn, contain collections of DataColumn and DataRow objects, as illustrated in Figure 4-8.

Creating custom field types is not really hard once you know the basics like you do now. However, what if you wanted to have a different background color for your display rendering You would need to create a new field type, even if your change is a small one.

Let s move on to demonstrating the last control, Menu, in Exercise 7-4.

Figure 4-8. The DataSet object model The data in a DataSet object can be inserted, updated, and deleted, and the object retains the details of any such modifications. However, being a generic, disconnected store for data, the DataSet object is completely unaware of the data source, which means that a dataset can be created from a database, a file, or programmatically, and it will always remain independent from the original source.

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One option to solve this is to use custom field properties. You may have noticed that when you create certain types of columns you get a set of configurable options in the Additional Column Settings section on the Create Column page. Figure 11-8 shows the typical lookup column additional settings.

The connection between the data provider-agnostic DataSet and a specific database store is the responsibility of another object in the ADO.NET architecture: the data adapter. The data adapter is data provider-specific. Each data provider contains its own data adapter version: SqlDataAdapter, OleDbDataAdapter, OracleDataAdapter, and so on. The data adapter s job is to handle the process of filling the DataSet with data from a database and post changes back to that database. The data adapter uses command objects to retrieve data from a database and later to post changes (insertions, updates, or deletions) back to it. Figure 4-9 diagrams the interaction between these objects.

The last navigation control is the Menu control. For your code examples, you are simply going to add the Menu control to the web pages. Feel free to use the Menu control in place of the Treeview control. It might make sense to have both of these controls in some web projects and it might not be a good idea in others. The beauty of it is that you are the developer, and it is totally your decision. 1. Drag and drop a Menu control from the Toolbox under the Navigation panel to each of the Web Forms: Default.aspx, AboutUs.aspx, ContactUs.aspx, and Products.aspx. As soon as you place the Menu control on each of the Web Forms, you will notice a small dialog box that gives you some options. The option you are concerned with at this point is the data source. Because you already have a SiteMapDataSource control on each of the pages from the prior examples, simply choose SiteMapDataSource1. After making the data source selection, just click away from the dialog box to apply the setting (Figure 7-10).

Figure 4-9. The interactions between the DataSet and data adapter objects As shown in the figure, a data adapter object has two key methods: Fill() and Update(). Both of these take a DataSet as an argument, and they use the command objects with which the data adapter is configured to interact with the database. During a Fill() call, the adapter executes its SelectCommand and loads the data into the corresponding tables inside the DataSet. During an Update() call, the adapter inspects the data in the DataSet and calls each command depending on what s happened to each row (it may have been inserted, updated, or deleted). As stated earlier, the DataSet itself keeps track of all such changes.

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