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cessing is complete and just before the page is rendered in HTML. This is an ideal place to store any leftover information that is required. You cannot store view state information in an event handler for the Page.Unload event. Though your code will not cause an error, the information will not be stored in view state, because the final HTML page output is already rendered.

The GridView doesn t support the addition of new data itself. It needs to be combined with the DetailsView or FormView to allow new data to be added. However, the GridView does allow you to update and delete existing data. We ll start out by creating a page for updating data.

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This includes dealing with correct MIME headers as well as caching images in the user s browser Dynamic image sizing Since users will upload different sizes and types of images, we must manipulate the images for a consistent layout We will simplify the process of image publishing by predetermining the layout of images within a blog post, although users will also have the ability to link to their images via the WYSIWYG editor we implemented in 7 One extra feature we will add will allow users to change the order in which their photos appear on a page We will use Scriptaculous to provide a simple interface for reordering images, and we will use Ajax to save the order of the images This will be similar to the example in 5 The steps we will cover in this chapter are as follows: 1.

You can store your own objects in view state just as easily as you store numeric and string types. However, to store an item in view state, ASP .NET must be able to convert it into a stream of bytes so that it can be added to the hidden input field in the page. This process is called serialization. If your objects aren t serializable (and by default they re not), you ll receive an error message when you attempt to place them in view state. To make your objects serializable, you need to add a Serializable attribute before your class declaration. For example, here s an exceedingly simple Customer class: [Serializable] public class Customer { private string firstName; public string FirstName { get { return firstName; } set { firstName = value; } }

private string lastName; public string LastName { get { return lastName; } set { lastName = value; } }

In this example, we ll use a GridView in a simple page that allows the basic details for a Player to be edited. 1. In Visual Web Developer, create a new Web site at C:\BAND\09 and delete the auto-generated Default.aspx file. 2. Add a new Web.config file to the Web site and add a new setting to the <connectionStrings /> element: <add name="SqlConnectionString" connectionString="Data Source=localhost\BAND;Initial Catalog=Players; Persist Security Info=True;User ID=band;Password=letmein" providerName="System.Data.SqlClient" /> 3. Add a new Web Form to the Web site called Players_Basic.aspx. Make sure that the Place Code in Separate File check box is unchecked. 4. In the Source view, find the <title> tag and change the page title to Players. 5. Switch to the Design view and add a SqlDataSource to the page. From the Tasks menu, select Configure Data Source. 6. Select SqlConnectionString as the data connection, and then click the Next button. 7. Create a query that selects the PlayerID, PlayerName, PlayerManufacturerID, PlayerCost, and PlayerStorage columns from the Player table. 8. Click the Advanced button. In the Advanced SQL Generation Options dialog box, click the Generate INSERT, UPDATE, and DELETE statements check box, as shown in Figure 9-1.

Adding an image-upload form to the blog post preview page 2 Adding a new controller action to output uploaded images 3 Displaying images on blog posts 4 Displaying a thumbnail on the blog index for each post with images 5 Allowing users to reorder and delete images from each blog post..

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