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n s 3 and 4, you saw how to build and pass queries to a database, both by using a SqlDataSource and by writing code to connect to the database and retrieve the required results using the ExecuteReader() and ExecuteScalar() methods Although we ve only scratched the surface of what is possible, we ve actually looked at the basics of everything you need to do, and you should now be able to build data-access pages that display data to the user This isn t the end of the story by any means You have a large number of options for displaying data, but they all boil down to whether you re going to work with the data directly from the database or store it on the Web server as disconnected data.

Once you ve added the reference, you can use the component by creating instances of the SimpleTest or SimpleTest2 class, as shown here:

Tip You can implement the WordCount stored procedure in many ways, so we encourage you to play with

Imports Components Public Partial Class TestPage Inherits Page Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load Dim testComponent As New SimpleTest() Dim testComponent2 As New SimpleTest2() lblResult.Text = testComponent.GetInfo("Hello") & "<br /><br />" lblResult.Text &= testComponent2.GetInfo("Bye") End Sub End Class

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You ll look at both options in this chapter: using the DataReader to work with the results of a query directly from the database or storing query results in a DataSet object on the Web server away from the database You ll also see how to create a DataSet locally with your own data, independent of an external data source Along the way, you ll look in some detail at the DataReader and DataSet objects, their makeup, and their differences At least one of these two objects will feature in every data-driven page you create, so it s good to be up to speed on how they work Indeed you ve actually looked at both the DataSet and DataReader objects.

The output for this page, shown in Figure 24-7, combines the return value from both GetInfo() methods.

SearchCatalog is the stored procedure that will perform the actual database search. When building it, you need to address three main issues: The form in which you ll pass the search string to the stored procedure The way to use the WordCount UDF to calculate ranking within search results The need to support the paging functionality for the presentation tier Let s analyze these requirements one at a time.

Figure 24-7. The SimpleTest component output To make this code slightly simpler, you can choose to use shared methods in the component class, so that you don t need to create an instance before using the methods. A shared GetInfo() method looks like this:

The examples in 4 returned data from the database as a DataReader, and the SqlDataSource you used in 3 actually uses a DataSet by default when retrieving data from its data source This chapter is only the first part of five in your journey through data handling For now, we ll assume that the data you request doesn t need to be displayed on screen In s 6 and 7, we ll assume that the data will be displayed on screen but is read-only and won t need to be updated In 8, you ll continue with building pages that allow you to create, modify, and delete data and reflect those changes back to the data source In 9, we ll take an in-depth look at three of the new Web controls introduced in ASPNET 20: GridView, FormView, and DetailView.

Public Class SimpleTest Public Shared Function GetInfo(param As String) As String Return "You invoked SimpleTest.GetInfo() with '" & _ param & "'" End Function End Class

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