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Columns in a DataSet can be referenced by name, but you must also name the DataTable and identify the row that contains the column. This means more complex binding expressions. A DataSet may be stored during postbacks if it isn t too great a drain on resources. A DataSet can be filled using Fill() from multiple data sources and isn t tied to a particular data source. You can even create a DataSet manually without ever using a data source, as you saw in 5. A DataSet is most suitable for working with complex data and data that needs to be updated on a page. You can bind as many list or table Web controls to a single DataSet as you want.

The business tier consists of the SearchCatalog method, which calls the SearchCatalog stored procedure. This data feeds our older friend, the ProductsList.ascx Web User Control, which displays the search results. Apart from a little bit of logic to handle splitting the search phrase into separate words (the presentation tier sends the whole phrase, but the data tier needs individual words) and to ensure we send a valid True/False value for the @AllWords parameter to the SearchCatalog stored procedure, there s nothing fantastic about this new method. Like always, you set up the stored procedure parameters, execute the command, and return the results. Add the Search method to your CatalogAccess class: // Search the product catalog public static DataTable Search(string searchString, string allWords, string pageNumber, out int howManyPages) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "SearchCatalog"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@DescriptionLength"; param.Value = BalloonShopConfiguration.ProductDescriptionLength; param.DbType = DbType.Int32; comm.Parameters.Add(param);

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<asp:ObjectDataSource ID="sourceItems" runat="server" TypeName="DatabaseComponent.DBUtil" SelectMethod="GetItems" UpdateMethod="AddItem" > </asp:ObjectDataSource>

The challenge is in making sure the UpdateMethod has the right signature. As with the SqlDataSource, updates, inserts, and deletes automatically receive a collection of parameters from the linked data control. These parameters have the same names as the corresponding field names. So in this case, the fields are Title, Price, and Description, which exactly match the parameter names in the AddItem() method. (The capitalization is not the same, but the ObjectDataSource is not case-sensitive, so this isn t a problem.) This still has a problem, however. When the user commits an edit, the GridView submits the three parameters you expect (Title, Price, and Description). However, the AddItem() method needs a fourth parameter CategoryID. We ve left that parameter out of the DetailsView fields, because you don t want the user to be able to set the category ID. However, you still need to supply it to the method. So where can you get the current category ID from The easiest choice is to extract it from the list box, just as you did for the GetItems() method. All you need to do is add a ControlParameter tag that defines a parameter named CategoryID and binds it to the SelectedValue property of the list box. Here s the revised tag for the ObjectDataSource:

<asp:ObjectDataSource ID="sourceItems" runat="server" SelectMethod="GetItems" TypeName="DatabaseComponent.DBUtil" InsertMethod="AddItem" > <SelectParameters> ... </SelectParameters> <InsertParameters> <asp:ControlParameter ControlID="lstCategories" Name="categoryID" PropertyName="SelectedValue" Type="Int32" /> </InsertParameters> </asp:ObjectDataSource>

A DataReader is most suitable for quickly binding data to Web controls. You can bind only one list or table to a DataReader. It must be re-created for other Web controls on the same page.

// create a new parameter param = comm.CreateParameter(); param.ParameterName = "@AllWords"; param.Value = allWords.ToUpper() == "TRUE" "True" : "False"; param.DbType = DbType.Boolean; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@PageNumber"; param.Value = pageNumber; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductsPerPage"; param.Value = BalloonShopConfiguration.ProductsPerPage; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@HowManyResults"; param.Direction = ParameterDirection.Output; param.DbType = DbType.Int32; comm.Parameters.Add(param); // define the maximum number of words int howManyWords = 5; // transform search string into array of words char[] wordSeparators = new char[] { ',', ';', '.', '!', ' ', '-', ' ' }; string[] words = searchString.Split(wordSeparators, StringSplitOptions.RemoveEmptyEntries); int index = 1; // add the words as stored procedure parameters for (int i = 0; i <= words.GetUpperBound(0) && index <= howManyWords; i++) // ignore short words if (words[i].Length > 2) { // create the @Word parameters param = comm.CreateParameter(); param.ParameterName = "@Word" + index.ToString(); param.Value = words[i]; param.DbType = DbType.String; comm.Parameters.Add(param); index++; }

Now you have all the parameters you need the three from the DetailsView and the one extra from the list box. When the user attempts to insert a new record, the ObjectDataSource collects these four parameters, makes sure they match the signature for the AddItem() method, puts them in order, and then calls the method. Figure 24-11 shows an insert in progress.

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