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1. As mentioned earlier, implementing output caching is less involved than its counterpart SQL Server caching. The first step is to add the page directives to the Web Form in which to cache: <%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %> <%@ OutputCache Duration="10" VaryByParam="none" %> Here you can see that there are only two page directives: the OutPutCache Duration and the VaryByParam. The Duration indicates the number of seconds the data or information will remain in the cache. The VaryByParam directive indicates if the page will still cache regardless of any parameters that are included. For our example, we simply specify none. 2. Proceed to the code beside of the Default.aspx Web Form. Add the following code to the Page_Load event, which will write the date and time to the browser: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Response.Write(DateTime.Now.ToShortDateString & " " & DateTime.Now.ToLongTimeString) End Sub 3. Build and run the web project. When the Default.aspx Web Form is loaded, it will resemble Figure 14-14. 4. When the page is loaded, continue to click the Refresh button in the browser. Notice that the date and timestamp does not change each time you click the Refresh button. However, after a ten-second interval, the page will display the updated date and timestamp because the cache duration has expired.

A natural next step is to further explore content type forms. You have two options, both defined in the XmlDocuments node. First there is the FormUrls type of XmlDocument, briefly mentioned earlier. You would use the FormUrls method if you want your content type to have completely separate pages for the user experience. The second method is to use the FormTemplates type of XmlDocument which, in contrast to the FormUrls, will use the default list form pages and insert your respective FormTemplate into the web part zone specified in the list form page. Both methods share the child elements Display, New, and Edit. The FormUrls child elements specify the URL of a form page, while the FormTemplates child elements specify just the name of a rendering template.

3. Import the following namespaces at the top of the FriendsBase.vb file: Imports Imports Imports Imports System.Data System.Data.SqlClient System.Configuration System.Web.Caching

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4. Now return to AssignPlaces.aspx.vb, and modify the InitForm() method so that it uses the cached dataset when populating the drop-down list: Private Sub InitForm() ' Initialize combo box If Not Page.IsPostBack Then ' Retrieve the dataset. ' If it's not already cached, ' it will be generated automatically and cached. Dim cachedDs As DataSet = MyBase.GetPlacesDataSet() ' Access the table by index Dim row As DataRow For Each row In ds.Tables(0).Rows ... Next End If End Sub 5. Finally, you need to invalidate the cached dataset when someone uses ViewPlace.aspx to edit the places-related information in the database. You must do this to ensure that no part of the application (such as AssignPlaces.aspx) uses outdated data. Open ViewPlace.aspx.vb and add the following lines to the end of the dlPlaces_UpdateCommand method: Private Sub dlPlaces_UpdateCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs) _ Handles dlPlaces.UpdateCommand ...etc... ' Invalidate the cached dataset Cache("PlacesChanged") = True End Sub This will ensure that, whenever the list of places is modified, the cached dataset will expire.

We will explore more details on how to actually build the forms and form templates in Part 3 of this book. Remember that, like all XmlDocuments, both FormUrls and FormTemplates are inherited, but once a content type has been used, changes to the parent XmlDocument will not be automatically propagated.

By implementing this kind of caching, a great deal of processing can be saved on the web server, hence aiding in overall performance. Depending on the content and its propensity for change, be cautious of the duration specified.

How It Works The lines that you removed from the LoadDataSet() method are the lines that created, initialized, and filled the old dataset with its contents. After these changes, those lines of code reemerge in the GetPlacesDataSet() method, which is the place that now has the responsibility for setting up the new cached dataset:

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