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It s worth taking a second look at the bits that are different from the previous exercises: The TieButton method tied the drop-down lists to their associated Go buttons. The FileUpload control uploaded product pictures to the server. The code is pretty clear, so take a closer look at the Click event handlers of the two Upload buttons to see how the FileUpload control is used in practice. Various tests are made in the buttons Click event handlers to display accurate status messages to the visitor. A novelty in this control is checking whether a value of the drop-down lists has been selected before trying to read its value (this is useful especially in the situation when the list is empty). The DropDownList controls are populated in the PopulateControls method, and they are capable of storing a key for each of their entries, similar to what the DataKeyNames property does for the GridView. In our case, this key retains the IDs of the listed categories. You read this ID from the DropDownList controls when the user tries to move, assign, or remove the product from a selected category, by reading the SelectedItem.Value property of the list.

path and the dynamic loading methods cannot find the assemblies. Solve this by copying all of the assemblies into a single directory and running the code.

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The first line is used to retrieve the assembly and type information from the configuration file. The second line is used to instantiate Impl1 and then typecast Implementations1. Implementation to type IDefinition. The cast will work because the IDefinition interface has been implemented by Implementations1.Implementation. The assigned variable definition will reference a valid object instance that implements IDefinition and the method TranslateWord(). At this point, we need to step back and reflect on what has occurred. We have defined within a configuration file the location of a type. Some source code in the application read the configuration file at runtime and stored the available types. The calling code knew about only the abstract type Impl1 and knew it implemented the interface IDefinition. Then, using some .NET magic involving dynamic techniques, the type s assembly is loaded and instantiated. This process is unique because an administrator has the ability to update where and what type should be instantiated and called, without needing to recompile or update the infrastructure. That flexibility makes it much simpler for you to update functionality without having to update the caller of the functionality.

filtering capabilities as well as features such as automatic data totaling, sorting, resizing, charting, and printing. You can also publish and synchronize changes to the data directly with a Microsoft Windows SharePoint site. To change a group of cells into an interactive list, select the cell group, click Data List Create List, and follow the on-screen directions.

In this chapter, you implemented the administrative features for your products, including features for adding or editing product details, assigning products to categories, uploading product pictures, and so on. You also updated BalloonShop to include edit buttons in the catalog pages, so administrators can much more easily access the administration pages for updating the catalog information. Now that the dry part of developing the administration end of our site is finished, we are finally ready to move on the really exciting features. In 13, you ll implement your own shopping cart in BalloonShop, replacing the PayPal shopping cart you ve been using so far.

Note The ability to dynamically update the functionality is of benefit to the administrator of the application.

elcome to the second stage of development! During this stage, you ll start improving and adding new features to the already existing, fully functional e-commerce site So, what exactly can you improve Well, the answer to this question isn t hard to find if you take a quick look at the popular e-commerce sites on the Web They personalize the experience for the user, provide product recommendations, remember customers preferences, and boast many other features that make the site easy to remember and hard to leave without first purchasing something In the first stage of development, you extensively relied on a third-party payment processor (PayPal) that supplied an integrated shopping cart, so you didn t record any shopping cart or order information in the database.

Right now, your site isn t capable of displaying a list of most wanted products or any other information about the products that have been sold through the web site because, at this stage, you aren t tracking the products sold Saving order information in the database is one of our priorities now because most of the features you want to implement next rely on having this information At the end of this chapter you ll have a functional shopping cart, but the visitor will not yet be able to order the products contained in it You ll add this functionality in 14, when you implement a custom checkout system that integrates with your new shopping cart.

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