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This way, the relationship between the two pages is clear, simple, and easy to maintain. You can probably change the controls in the source page (CrossPage1) without needing to change other parts of your application. For example, if you decide to use different controls for name entry in CrossPage1.aspx, you will be forced to revise the code for the FullName property. However, your changes would be confined to CrossPage1.aspx, and you wouldn t need to modify CrossPage2.aspx at all. Here s how you can rewrite the code in CrossPage2.aspx to display the information from CrossPage1.aspx: protected void Page_Load(object sender, EventArgs e) { if (PreviousPage != null) { lblInfo.Text = "You came from a page titled " + PreviousPage.Title + "<br />"; CrossPage1 prevPage = PreviousPage as CrossPage1; if (prevPage != null) { lblInfo.Text += "You typed in this: " + prevPage.FullName; } } } Notice that the target page (CrossPage2.aspx) can access the Title property of the previous page (CrossPage1.aspx) without performing any casting. That s because the Title property is defined as part of the base System.Web.UI.Page class, and so every web page includes it. However, to get access to the more specialized FullName property you need to cast the previous page to the right page class (CrossPage1), or use the PreviousPageType directive that was discussed earlier. Figure 7-5 shows the new result.

Note If you prefer to store your images in the database, you shouldn t have too much trouble extending

s Note Cross-page postbacks are genuinely useful, but they can lead the way to more complicated pages.

19. Also add a Page_Load event, and then add the following code to the event handler: protected void Page_Load(object sender, EventArgs e) { lblError.Visible = false; } 20. Save the page. Now try to delete a Player. Instead of the ASP .NET error message, you ll receive a nicer warning, as shown in Figure 9-7.

the SQL we will create here to do so. However, to produce and save the thumbnail images as the way I describe in this chapter, it is likely that you will still need to store some files on the filesystem.

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If you allow multiple source pages to post to the same destination page, it s up to you to code the logic that figures out which page the user came from and then act accordingly. To avoid these headaches, it s easiest to perform cross-page postbacks between two specific pages only.

With only a few lines of code, you ve built a page that allows you to edit information for the Players in the database. It s not perfect though, as the error you received when trying to delete a Player from the database shows. Deleting Players from the database isn t the only problem, however. The page that you ve built has at least four problems: The page isn t very user-friendly. Instead of showing the name of the Manufacturer, you re showing the PlayerManufacturerID. Now you may know that a value of 1 for PlayerManufacturerID corresponds to Apple, but what about the others You can t delete a Player from the database. As you learned in 8, whenever you modify the database, you re bound by the database rules. In the sample database, Players are part of a relationship with the WhatPlaysWhatFormat table. As the error in Figure 9-6 shows, the Player is part of a relationship with the WhatPlaysWhatFormat table, and the constraints in the database prevent you from deleting a Player without deleting the referencing rows from the WhatPlaysWhatFormat table first. You can t add a new Player to the database. Although the GridView allows you to edit and delete data, it doesn t allow you to add new data. You can t deal with the Player s supported Formats. The GridView allows you to handle details from the Player table and, with a little more work, also the relationship to the Manufacturer of the Player, but it doesn t allow you to handle the many-to-many relationship with the Formats that the Player may support.

ASP .NET uses some interesting sleight of hand to make cross-page postbacks work. The first time the second page accesses Page.PreviousPage, ASP .NET needs to create the previous page object. To do this, it actually starts the page processing but interrupts it just before the PreRender stage, and it doesn t let the page render any HTML output. However, this still has some interesting side effects. For example, all the page events of the previous page are fired, including Page.Load and Page.Init, and the Button.Click event also fires for the button that triggered the cross-page postback. ASP .NET fires these events because they might be needed to return the source page to the state it was last in, just before it triggered the cross-page postback.

We will first create a table in the database to store information about each uploaded image. This table will hold the filename of the original image as well as a foreign key that links this table to the blog_posts table. The final ranking column will be used to record the order of the images in a blog post.

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