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The following points are worth noting about this code: The code writes to the ListBox using a private Log() subroutine. The Log() subroutine adds the text and automatically scrolls to the bottom of the list each time a new entry is added, thereby ensuring that the most recent entries remain visible. All the change events are handled by the same method, CtrlChanged().If you look carefully at the .aspx file, you ll notice see that each input control connects its monitored event to the CtrlChanged() method. The event-handling code in the CtrlChanged() method uses the source parameter to find out what control sent the event, and it incorporates that information in the log string. The page includes event handlers for the Page.Load and Page.PreRender events. As with all page events, these event handlers are connected by method name. That means to add the event handler for the Page.PreRender event, you simply need to add a method named Page_PreRender(), like the one shown here. The page includes event handlers for the Page.Load and Page.PreRender events. As with all page events, these event handlers are connected by method name. That means to add the event handler for the Page.PreRender event, you simply need to add a method named Page_PreRender(), like the one shown here.

the e-mail address to be spammed, since the e-mail value must comply with 3.3.2 of RFC 2426 (available from http://www.ietf.org/rfc/rfc2426.txt). Unless your hCard is available only to trusted users, a better option may be not to include the e-mail address at all.

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The code to save the changes to the database is exactly the same as before. The Update() method commits all changes to the database and chooses the UpdateCommand in this instance. If you look at the query in the RowUpdating event handler, you ll see that the UPDATE query is a lot more complex than you might expect: UPDATE Manufacturer SET ManufacturerName = @p1 WHERE ((ManufacturerID = @p2) AND (ManufacturerName = @p3) AND ((@p4 = 1 AND ManufacturerCountry IS NULL) OR (ManufacturerCountry = @p5)) AND ((@p6 = 1 AND ManufacturerEmail IS NULL) OR (ManufacturerEmail = @p7)) AND ((@p8 = 1 AND ManufacturerWebsite IS NULL) OR (ManufacturerWebsite = @p9))) This is the query generated when you change only the ManufacturerName. If you changed all four values (name, country, e-mail address, and Web site address), the query becomes even more complex, with twelve parameters rather than the nine here. The UPDATE query is generated on the fly and updates only the columns that have been modified, but does it really need to be this complex Although this UPDATE query works, it isn t as efficient as it could be. You ll see shortly that you can add your own queries, rather than using the CommandBuilder auto-generated ones.

Now that you ve had a whirlwind tour of the basic web control model, it s time to put it to work with the second single-page utility. In this case, it s a simple example for a dynamic e-card generator. You could extend this sample (for example, allowing users to store e-cards to the database), but even on its own, this example demonstrates basic control manipulation with ASP.NET. The web page is divided into two regions. On the left is an ordinary <div> tag containing a set of web controls for specifying card options. On the right is a Panel control (named pnlCard), which contains two other controls (lblGreeting and imgDefault) that are used to display userconfigurable text and a picture. This text and picture represents the greeting card. When the page first loads, the card hasn t yet been generated, and the right portion is blank (as shown in Figure 6-15).

It may seem as though from the previous example that we re not actually doing anything differently than what we would normally. Indeed, this is true, except by using microformats we are forced to name particular elements in a certain way. This provides a uniformity between all sites that use microformats. It is fair to say that an extremely large majority of web users will have no idea you are using microformats, because currently it doesn t actually change their experience in any way. However, if you make a conscious effort to use microformats wherever you can, already you are forcing yourself to write clean and consistent code. Although I am only speculating, I believe as the uptake of microformats continues and its popularity amongst web developers increases, it will become a crucial and widely used tool by end users, just as the popularity of RSS and Atom feeds has grown in the past few years. All major browsers now have built-in web feed readers (Microsoft has put an emphasis on web feeds with the release of Internet Explorer 7 and Windows Vista in the past year). It is highly possible that in upcoming releases of web browsers that microformat readers will be integrated.

s The <div> tag is useful when you want to group text and controls and apply a set of formatting propTip

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