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Figure 7.2 A published presentation showing the table of contents and slides area. Selecting the Font and Colors for the Table of Contents The table of contents provides an outline or guide to your presentation. It lets your users see a list of topics that are covered in your presentation. The topics are clickable links that the audience can use to navigate through your presentation. Therefore, if an individual watching your presentation in his or her Web browser wanted to watch a specific part of the presentation, he or she could do so by clicking the corresponding table of contents entry. 9 discusses the process of creating and editing a table of contents for your presentation. The fonts that you can select for table of contents entries consist of a list of fonts that will display properly in most Web browsers. These are fonts that are common and are likely to be installed on your audience s computers. This is important because your audience must have the selected font installed on their computers in order to see the font in their Web browsers when they watch your published presentation. In addition to specifying the font for the table of contents, you can select the font size (which determines how

C# ItemsControl someItemsControl = new ItemsControl(); someItemsControl.Items.Add(new TextBox()); bool hasDependencyObjects = someItemsControl.Items.Any(item => item is DependencyObject);

The IDENTITY property can be convenient when you want SQL Server to generate single column keys in a table. To guarantee uniqueness, create a PRIMARY KEY or UNIQUE constraint on the identity column. Upon INSERT, SQL Server increments the table's identity value and stores it in the new row. However, the IDENTITY property has several limitations that might make it an impractical sequencing mechanism for some applications. One limitation is that the IDENTITY property is table dependent. It's not an independent sequencing mechanism that assigns new values that you can then use in any manner you like. Imagine that you

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need to generate sequence values that will be used as keys that cannot conflict across tables. Another limitation is that an identity value is generated when an INSERT statement is issued, not before. There might be cases where you need to generate the new sequence value and then use it in an INSERT statement, and not the other way around. Another aspect of the IDENTITY property that can be considered a limitation in some cases is that identity values are assigned in an asynchronous manner. This means that multiple sessions issuing multirow inserts might end up getting nonsequential identity values. Moreover, the assignment of a new identity value is not part of the transaction in which the INSERT was issued. These facts have several implications. SQL Server will increment the table's identity value regardless of whether the insert succeeds or fails. You might end up with gaps in the sequence that were not generated by deletions. Some systems cannot allow missing values that cannot be accounted for (for example, invoicing systems). Try telling the Internal Revenue Service (IRS) that some of the missing invoice IDs in your system are a result of the asynchronous manner in which identity values are managed.

I'll suggest a couple of solutions to the problem of maintaining a custom sequencing mechanism. I'll show both synchronous and asynchronous solutions.

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However, because the Items property is not IEnumerable<T> in WPF, this approach does not work. Instead of creating a different version for WPF and Silverlight, opt for a less-preferable single source solution, as shown in the following code.

You need a synchronous sequence generator when you must account for all values in the sequence. The classic scenario for such a sequence is generating invoice numbers. The way to guarantee that no gaps occur is to lock the sequence resource when you need to increment it and release the lock only when the transaction is finished. If you think about it, that's exactly how exclusive locks behave when you modify data in a transactionthat is, a lock is acquired to modify data, and it's released when the transaction is finished (committed or rolled back). To maintain such a sequence, create a table with a single row and a single column holding the last sequence value used. Initially, populate it with a zero if you want the first value in the sequence to be 1: USE tempdb; GO IF OBJECT_ID('dbo.SyncSeq') IS NOT NULL DROP TABLE dbo.SyncSeq; GO CREATE TABLE dbo.SyncSeq(val INT); INSERT INTO dbo.SyncSeq VALUES(0);

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