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In the third Label, lnkEmail, you ve attempted to bind to two properties, NavigateUrl and Text. However, you encountered the problem that hyperlinks require e-mail addresses to be prefixed with mailto: for them to be recognized as e-mail addresses rather than Web site addresses by the browser. Thus, you tried to concatenate text and binding expression inside the Web control s attribute, like so: NavigateUrl='mailto: <%# DataBinder.Eval (myReader, "[2]") %>' This doesn t work, because you can t mix the two inside a Web control s property. As soon as you do, ASP.NET regards the binding expression as literal text instead of as a placeholder for data. Also, you have no way to alter the value of the column in the DataReader. But it is possible to format the value of the column as it s being bound to the Web control using an alternate version of DataBinder.Eval(). You just pass it the format string mailto:{0} as its third parameter, and DataBinder.Eval() will retrieve the column from the DataReader, substitute it for the placeholder {0}, and assign the newly formatted string to the property: <asp:HyperLink ID="lnkEmail" runat="server" NavigateUrl='mailto: <%# DataBinder.Eval (myReader, "[2]") %>' Text='<%# DataBinder.Eval (myReader, "[ManufacturerEmail]") %>'> </asp:HyperLink> Also notice that you ve used both methods of referring to a column here. The column index is used by NavigateUrl, and the column name is used by the Text property. As noted earlier, these are interchangeable and, at least with the SELECT query as it stands at the moment, both refer to the same column within the row. Finally, the fourth Label on the page demonstrates that you can bind to both the properties and the text value of a Web control at the same time: <asp:HyperLink ID="lnkWebsite" runat="server" NavigateUrl='<%# DataBinder.Eval (myReader, "[3]") %>'> <%# DataBinder.Eval (myReader, "[ManufacturerWebsite]") %> </asp:HyperLink>

After the PayPal account is set up, the email address you provided will be your PayPal ID. The PayPal service provides a lot of functionality, and because the site is easy to use and many of the functions are self-explanatory, we won t describe everything here. Remember that these sites are there for your business, so they re more than happy to assist with any of your queries. Now let s see how you can actually use the new account for the web site.

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state for the control. For example, this is why you use view state with data-bound web pages, even though the controls are refilled from the data source after every postback. View state won t materially slow down your server, but it will increase the page size and hence the time required to send the page to the client. From the user s point of view, the application will feel less responsive, particularly if connecting over a slow connection. Generally, view state becomes most significant when dealing with large controls that can contain large amounts of data. The problem is that this data exerts a greater toll on your application because it s added to the web page twice: directly in the HTML for the control, and again in the hidden label used for view state. It s also sent to both the client and then back to the server with each postback. To get a handle on whether view state could be an issue, use page tracing (as described in 7) to see how many bytes the current page s view state is consuming.

Tip Both of these issues (static text and view state) are fairly minor refinements. They can speed up

With all the placeholders for the data set up, it s just a matter of creating the DataReader, accessing the first row (you still have to call Read() or else there s nothing to bind to), and calling DataBind():

In the first stage of development (the current stage), you need to integrate the shopping cart and checkout functionality from PayPal. In the second stage of development, after you create your own shopping cart, you ll only need to rely on PayPal s checkout mechanism. To accept payments, you need to add two important elements to the user interface part of the site: Add to Cart buttons for each product and a View Cart button somewhere on the page. PayPal makes adding these buttons a piece of cake. The functionality of those buttons is performed by secure links to the PayPal web site. For example, the following form represents the Add to Cart button for a product named Welcome Back that costs $12.99: <form target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post"> <input type="hidden" name="cmd" value="_cart"> <input type="hidden" name="business" value="your_email_address"> <input type="hidden" name="item_name" value="Welcome Back"> <input type="hidden" name="amount" value="12.99"> <input type="hidden" name="currency" value="USD"> <input type="image" src="Images/AddToCart.gif" name="submit"> <input type="hidden" name="add" value="1"> </form> The fields are predefined and their names are self-explanatory. The most important is business, which must be the email address you used when you registered the PayPal account (the email address that will receive the money). Consult PayPal s Website Payments Standard Integration Guide for more details.

download times, particularly if your application is being used by clients with slow Internet connections. However, these issues will almost never cause a serious problem in your application the way poor database or session state code can. Don t spend too much time tweaking your controls, but do keep these issues in mind while programming so you can optimize your pages when the opportunity presents itself.

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