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Note In some cases, you might need to supply an extra parameter that needs to be set programmatically.

Summary

// execute the stored procedure and save the results in a DataTable DataTable table = GenericDataAccess.ExecuteSelectCommand(comm); // calculate how many pages of products and set the out parameter int howManyProducts = Int32.Parse(comm.Parameters["@HowManyResults"].Value.ToString()); howManyPages = (int)Math.Ceiling((double)howManyProducts / (double)BalloonShopConfiguration.ProductsPerPage); // return the page of products return table; } Because the code is pretty clear, it s not worth analyzing it again in detail. However, note the following aspects: To guard against bogus values, we make sure to set the @AllWords parameter strictly to True or False, using the allWords.ToUpper() == "TRUE" "True" : "False" construct. The words in the search phrase are split on the list of characters contained in the wordSeparators array. There s a for loop to add the @Word parameters. Short words (fewer than three letters long) are considered noise words and are not used for the search. Feel free to change this rule to suit your particular solution. The words searched for are returned though an out parameter, so the presentation tier is able to tell the visitor which words were actually used for searching. The number of pages is given by dividing the number of products by the number of products per page.

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In this case, you need to define a plain-vanilla Parameter tag (instead of a ControlParameter tag), with a name and data type but no value. Then you can respond to the ObjectDataSource.Updating event to fill in the value you need just in time. It s a little messy (and it forces you to write code in your web page), but it s sometimes a necessity.

The examples in this chapter demonstrate safe, solid ways to create components and integrate them into your website. As you can see, these objects respect the rules of encapsulation, which means they do a specific business task, but they don t get involved in generating the user interface for the application. For example, the DBUtil class uses ADO.NET code to retrieve records or update a database. It s up to other controls, such as the GridView and DetailsView, to provide the presentation. The next chapter shows how you can use the same component-oriented approach to reuse a user interface in multiple web pages with custom controls.

In this chapter, you learned how to bind the query results to a table-based Web control such as a GridView, DataList, or Repeater. Unless you tell it otherwise, the GridView will present the results in a preformatted grid, one column per table cell; the DataList and Repeater, on the other hand, must be given a template for each row of information to be displayed. You learned that you can customize the GridView quite heavily, even when it auto-generates a grid to display query results. You can use SQL to make the data more readable, use styles to make it more attractive, and implement simple sorting and paging functions to improve the way that users can view the results. In the next chapter, you ll finish your look at handling the data from a query by exposing it as read-write data. You ll also learn how to send the changes made to that data back to the database.

Note The maximum number of allowed words and the list of characters used to split the search string are hard-coded. In case you think any of these could ever change, it s strongly recommended to save their values in web.config. Also note that increasing the maximum number of allowed words implies updating the SearchCatalog stored procedure as well.

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