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TIP: Keep in mind that the contacts search feature uses first, last, and company names. When you add or edit contacts, adding a special word to the company name can help you find a particular contact later. For example, adding the words Cece friend to the Company field can help you find all of Cece s friends quickly using the search feature. Under the First Last button are five more buttons, as shown in Figure 19 2. Each is activated by touching either the green + to the left of the button (when available) or the button itself.

4. 5.

For example, what happens when someone is using your stock application on a cell phone and he or she suddenly gets a phone call Can the user easily suspend the application Is this automatically done by the device.

<ContextualGroup Defines contextual Id="WebPartsInAction.ContextualTabGroup" group Color="Orange" Sets Sequence="2000" contextual tab color Title="RSS Feed" ContextualGroupId="RSSFeedContextualTabGroup" Command="RssWebPart.ContextualGroupCommand"> <Tab Id="WebPartsInAction.RssContextualTab" Title="RSS Feed" Description="RSS Web Part contextual Ribbon tab" Sequence="1000" Command="RssWebPart.TabCommand"> <Scaling Id="WebPartsInAction.RssContextualTab.Scaling" > <MaxSize

public static class LocalSiteMap { public static class Nav { public static readonly string Products = "products"; }

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You can compile and run this code if you would like to see the message boxes we created. You can generate an open error easily enough by selecting a file that is not, in fact, an album file. A save error can be generated by attempting to save to a read-only CD, or by filling up a floppy disk and then saving a file to it. Our last example will generate a message box for closing an existing album. 8.1.4 Creating A YesNoCancel dialog Our final example is the case where an album has changed but is about to be discarded. This can occur when the application is about to exit, when loading a new album with the Open menu item, and when creating a new album with the New menu item. To handle these situations in a consistent way, we will create a protected method to gracefully close the current album for all three cases using the dialog in figure 8.4. We will call this method CloseCurrentAlbum and have it return a boolean value indicating whether the album was closed or the user Figure 8.4 This dialog is displayed when an album is about to be discarded. clicked the Cancel button. DIALOG BOXES

The main operational part of the Mirrors system is its constructor:

The detached computer object and any other detached objects it refers to are now associated with the new transient laptops object (and vice versa). You make this change to the object graph persistent by saving the new object in a second NHibernate session:

You can export the bookmarks list to an XML file B (in listing 7.15) using the Latin-1 encoding (see the "ISO8859-1" parameter), accepting only ASCII characters (see the true parameter). The resulting XML file looks like this:

As a bonus, try adding EnableViewState = "False" to the Page directive, and then run the application again. Instead of appending each new line to the string, every postback will overwrite the existing string. Exercise 7-3. For this exercise, you need to use the Session dictionary instead of the state bag. Start by adding the two new buttons to Default.aspx, and give each of them a handler that uses Response.Redirect to point to SecondPage.aspx and ThirdPage.aspx. You ll need to make some changes to the code-behind file of Default.aspx. First, replace the ViewState methods with Session. In addition, you have to make a change to the first half of the If statement:

In listing 9.4, it s unclear if a writer lock is needed until the bid amount is compared to the current price. In the last section, we dealt with this by acquiring a write lock. A more optimal solution is to acquire a read lock and determine if a write lock is required. If it is, we call UpgradeToWriterLock. The advantage is that we only require a write lock when it is needed. Since write locks keep all reader locks from accessing data, using them unnecessarily results in reduced performance. Be careful when upgrading from a read to a write lock. There is a relatively small chance that during the transition from read to write some other pending write request may change the value. Figure 9.4 presents a graphical version of the logic involved.

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