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The DataGrid control is certainly a convenient control to use for displaying the results of a search or displaying simple records. However, DataGrid has some deficiencies as an editing tool. First and foremost, notice the difference in the overall width of the data grids shown in Figure 9-1 and Figure 9-2. This difference is a bit of a problem when you re working with the number of fields in the example DataGrid, but it would be a far worse problem if there were many more fields. The second deficiency is the lack of easy control over how the editing takes place. One solution to this problem is to use TemplateColumn objects to describe what the column should look like when it s being viewed and when it s being edited. Using a TemplateColumn object and setting the EditItemTemplate property is a reasonable approach when perhaps only one or two columns in a record are to be edited. The Customer table that we ve been working with contains both of these deficiencies. First, the Customer table includes date columns and an e-mail column. These columns require special validation in the case of the ContractEnds field, a check for a valid date, and in the case of the ContactEMail field, a check for a plausible e-mail address. Next, the Customer table has quite a few more columns than could be conveniently displayed one per column across the page. Listing 9-3 shows the SQL statement to create the full Customer table. Listing 9-3 SQL statement to create the Customer table

Trigger Time Execution Single worker Types of tasks An operation on a set of data that updates frequently and requires an exclusive lock to avoid concurrency issues. Examples include aggregation, summarization, and denormalization. An operation on a set of data that is mutually exclusive from other sets so that there are no concurrency issues. Independent operations that don t work over data such as a ping. An operation on a small number of resources (for example, a BLOB or several table rows) that should start as soon as possible.

To install the practice test software from the companion CD to your hard disk, perform the following steps:

Setting freed pointers to NULL also allows you to check whether a pointer is set to NULL before you use it or attempt to delete it again; if you don t set freed pointers to NULL, you won t have that option. That suggests another addition to the pointer deletion code:

DECLARE @app AS VARCHAR(10), @prevapp AS VARCHAR (10), @ts AS datetime, @event_type AS INT, @concurrent AS INT, @mx AS INT; DECLARE @Result AS TABLE(app VARCHAR(10), mx INT); DECLARE C CURSOR FAST_FORWARD FOR SELECT app, starttime AS ts, 1 AS event_type FROM dbo.Sessions UNION ALL SELECT app, endtime, -1 FROM dbo.Sessions ORDER BY app, ts, event_type; OPEN C; FETCH NEXT FROM C INTO @app, @ts, @event_type; SELECT @prevapp = @app, @concurrent = 0, @mx = 0; WHILE @@fetch_status = 0 BEGIN IF @app <> @prevapp BEGIN INSERT INTO @Result VALUES(@prevapp, @mx); SELECT @prevapp = @app, @concurrent = 0, @mx = 0; END SET @concurrent = @concurrent + @event_type; IF @concurrent > @mx SET @mx = @concurrent;

As you can see in the execution plans shown in Figure 5-7 for the two query variations, the solution using the NOT EXISTS predicate performs better.

Objective 3.4: Troubleshoot Network Protocol Security . . . . . . . . . . . . . . . . . . 15-29

The IndentFileLogger starts each log message with the event type that raised it. From the preceding output you can see the order in which these events are raised. BuildStarted will be followed by ProjectStarted, then TargetStarted and any task related events inside of that. Messages, errors, warnings, and status events can be raised at any point during the build process. We will move on to discuss creating custom loggers by taking a look at a very simple logger, the HelloLogger. The HelloLogger will not accept any parameters and it will ignore the Verbosity setting. We will leave that for other examples later in this chapter. The Initialize method for this logger is shown as follows.

Referring to Figure 8-2, you will notice that the content is divided into two sections: one for directories (top) and one for files (bottom). Let s first take care of the section for directories. 6. In Grid.Row and Grid.Column (1,0), place another StackPanel, which spans two rows, with a couple TextBlock controls, three Button controls, and two ListBox controls. The XAML should appear as follows (again, with some of the source code omitted, but the changes are shown):

MMC is a multiple-document-interface (MDI) application (the Console Root window is a child window), although most of the consoles supplied with Windows do their best to disguise this fact. You can create consoles with multiple child windows, and those windows can be maximized, minimized, restored, resized, moved, cascaded, and tiled, all within the confines of the main MMC window.