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For more robust implementations, turn to IDataErrorInfo and INotifyDataErrorInfo. The two can be complex to implement, especially the latter, but you re provided with pretty much everything you d need to implement your own validation framework on top of the base interfaces. When combined with the DataGrid and DataForm, attribute-based validation, along with the UI hinting covered in chapter 12, provides an incredibly simple and powerful way to create capable user interfaces with little plumbing code required. Now that we ve covered binding in chapter 11 and validation in this chapter and introduced the concept of a web service, it s time we dove right into the communications and networking stack that drives most Silverlight applications. 14 will cover how to use web and REST services as well as how to implement other forms of communication in your applications.

TIP: It s worth mentioning that I ve started using enum values for tags, like LayerTagGameLayer. This has the advantage over using numbers in that you can actually read whose tag it is, instead of having to remember which layer had tag number 7 assigned to it. It also shows that the actual tag values are not important; what s important is that you use the same value consistently for the same node. Using a human-readable tag makes that task easier and less error prone. The same goes for action tags, of course. You may have noticed the variable multiLayerSceneInstance and that it gets self assigned. A bit strange, isn t it What would that be good for If you recall from 3, I explained how to create a singleton class. In this case, I ll turn the MultiLayerScene class into a singleton. See Listing 5 5 and if you want, compare it with Listing 3-1 to spot the differences.

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While this input parameter initially seems complex, once you understand it, it ll seem easy. The first part to mention is the name of the parameter. This maps to the name given to a parameter in either our SQL statement or stored procedure.

If the Dataset dialog box does not open as shown in figure 13.6, then click the ellipsis ( ) button to the right of the DataSet selection drop-down list.

Anything with an audio source should expose the ability to temporarily mute the audio. Thankfully, the MediaElement exposes an IsMuted property. This property allows you to programmatically determine whether the sound associated with a MediaElement is audible. If a MediaElement is playing and this boolean property is set to true, the MediaElement will continue to play, but it won t be audible. As a bool, the IsMuted property is all or nothing. Usually, you ll need to find a happy medium between audible and inaudible. Silverlight also gives you this type of control through the Volume property.

I have a named instance on my machine named sql2008; if you don t have a named instance, just use (local), or if you do have a named instance, use (local)\InstanceName.

WireFeedOutput out = new WireFeedOutput(); out.output(feed.createWireFeed(feedType), new PrintWriter(System.out));

Different blog servers have different levels of support for users and privileges, with the most limited allowing only one user per blog, and most capable of allowing each user to have multiple blogs and group blogs, blogs with more than one user. If your blog server does not support group blogs, you can approximate one by using an aggregator, as described in chapter 12. Now that we understand how data is stored in a blog server, let s move on to architecture.

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