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Note You ll notice that you haven t added error handling for the UPDATE query to this example. Nor do you add any new error handling to any of the examples from this point forward. The process for handling errors is the same for INSERT, UPDATE, and DELETE, so once you ve seen it, adding it again (and again and again) to the examples will just make them longer for no added benefit.

Session state is global to your entire application for the current user. However, session state can be lost in several ways:

If the user closes and restarts the browser. If the user accesses the same page through a different browser window, although the session will still exist if a web page is accessed through the original browser window. Browsers differ on how they handle this situation. If the session times out due to inactivity. More information about session timeout can be found in the configuration section. If your web page code ends the session by calling the Session.Abandon() method. In the first two cases, the session actually remains in memory on the web server, because ASP.NET has no idea that the client has closed the browser or changed windows. The session will linger in memory, remaining inaccessible, until it eventually expires. Table 7-1 describes the methods and properties of the HttpSessionState class. Table 7-1. HttpSessionState Members

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We can use the tagsAction() function we created in 10 as a basis for the new imagesAction() function. The functionality of these two functions is almost identical: in both we must first load a blog post; next, we must determine the action to take (in this case, it s whether to upload, reorder, or delete an image; in tagsAction() it was whether to add or delete a tag); finally, we will redirect the browser back to the blog post preview. Listing 11-5 shows the code we will add to the BlogmanagerController.php class (in ./include/Controllers) in order to manage images. For now we will simply include placeholders for the other image operations. Listing 11-5. The Action Handler for Image Management (BlogmanagerController.php) < php class BlogmanagerController extends CustomControllerAction { // ... other code public function imagesAction() { $request = $this->getRequest(); $post_id = (int) $request->getPost('id'); $post = new DatabaseObject_BlogPost($this->db); if (!$post->loadForUser($this->identity->user_id, $post_id)) $this->_redirect($this->getUrl()); if ($request->getPost('upload')) { $fp = new FormProcessor_BlogPostImage($post); if ($fp->process($request)) $this->messenger->addMessage('Image uploaded'); else { foreach ($fp->getErrors() as $error) $this->messenger->addMessage($error); } } else if ($request->getPost('reorder')) { // todo

In this example, you ll expand on the previous example by changing the Web control that is used for setting the Manufacturer for a Player. Rather than using a TextBox, you ll populate a DropDownList with the list of Manufacturers and let the users select which Manufacturer they want. 1. Open Players_Basic.aspx from the previous example. 2. Add a second SqlDataSource to the page (this will be given an ID of SqlDataSource2). Use the SqlConnectionString to connect to the correct database, and set the SelectCommand to the following: SELECT ManufacturerID, ManufacturerName FROM Manufacturer ORDER BY ManufacturerName 3. Switch to the Source view and change the SelectCommand for SqlDataSource1 to the following: SELECT PlayerID, PlayerName, ManufacturerName, PlayerManufacturerID, PlayerStorage, PlayerCost FROM Player INNER JOIN Manufacturer ON Player.PlayerManufacturerID = Manufacturer.ManufacturerID 4. Replace the PlayerManufacturerID BoundField with the following TemplateField: <asp:TemplateField HeaderText="Manufacturer" SortExpression="ManufacturerName"> <ItemTemplate> <asp:Literal ID="litManufacturer" runat="server" Text='<%# Eval("ManufacturerName") %>'> </asp:Literal> </ItemTemplate> <EditItemTemplate> <asp:DropDownList id="lstManufacturer" runat="server" DataSourceID="SqlDataSource2" DataTextField="ManufacturerName" DataValueField="ManufacturerID" SelectedValue='<%# Bind("PlayerManufacturerID") %>'> </asp:DropDownList> </EditItemTemplate> </asp:TemplateField>

Provides the number of items in the current session collection. Identifies whether the session is tracked with a cookie or modified URLs. Identifies whether the session was created only for the current request. If no information is in session state, ASP.NET won t bother to track the session or create a session cookie. Instead, the session will be re-created with every request. Provides an enumerated value that explains how ASP.NET stores session state information. This storage mode is determined based on the web.config settings discussed in the Session State Configuration section later in this chapter. Provides a string with the unique session identifier for the current client. Determines the number of minutes that will elapse before the current session is abandoned, provided that no more requests are received from the client. This value can be changed programmatically, letting you make the session collection longer when needed. Cancels the current session immediately and releases all the memory it occupied. This is a useful technique in a logoff page to ensure that server memory is reclaimed as quickly as possible. Removes all the session items but doesn t change the current session identifier.

Abandon()

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