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One of the key reasons to prefer .NET 3.5 over .NET 3.0 is its support for Language Integrated Query (LINQ), which is an all-purpose query syntax that works across a variety of data sources and is closely integrated with the VB language. LINQ works with any data source that has a LINQ provider. Using the support that s included with .NET 3.5, you can use similarly structured LINQ queries to retrieve data from an in-memory collection, an XML file, or a SQL Server database. And as with other query languages, LINQ allows you to apply filtering, sorting, grouping, and transformations to the data you retrieve. Although LINQ is somewhat outside the scope of this chapter, you can learn a lot from a simple example. For example, imagine you have a collection of Product objects, named products, and you want to create a second collection that contains only those products that exceed $100 in cost. Using procedural code, you can write something like this: ' Get the full list of products. Dim products As List(Of Product) = Application.StoreDB.GetProducts()

Notice that the timer itself is a member variable code: private: System::Timers::Timer^ timer;.

Alternatively, you can (and probably should) configure a .reg file, the contents of which are shown in Listing 3-4. Listing 3-4. Registration File Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\8.0\ TeamFoundation\SourceControl\Checkin Policies] "CheckForCommentsPolicy"="[Full Path to File]\\CheckForCommentsPolicy.dll" After you run this file (simply double-click on it and you will be prompted to make the change to the registry), the Check for Comments Policy will be displayed in the list of available policies (Figure 3-36).

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' Create a second collection with matching products. Dim matches As New List(Of Product) For Each product As Product In products If product.UnitCost >= 100 Then matches.Add(product) End If Next Using LINQ, you can use the following expression, which is far more concise: ' Get the full list of products. Dim products As List(Of Product)= Application.StoreDB.GetProducts() ' Create a second collection with matching products. Dim matches As IEnumerable(Of Product) matches = From product In products _ Where product.UnitCost >= 100 _ Select product This example uses LINQ to Collections, which means it uses a LINQ expression to query the data in an in-memory collection. LINQ expressions use a set of new language keywords, including From, In, Where, and Select. These LINQ keywords are a genuine part of the VB language.

The reason the timer is a member variable is that other Windows service handlers are going to need access to it. Next, you add an event handler to the timer s Elapse handler. Here s the code for the handler: private: void timer_Tick(System::Object^ sender, System::Timers::ElapsedEventArgs^ e) { this->timer->Stop(); eventLog1->WriteEntry("SimpleWinService Elapsed Event Occurred"); this->timer->Start(); }

s Note A full discussion of LINQ is beyond the scope of this book. (For a detailed treatment, refer to the

Figure 3-36. Custom check-in policy With this example in hand, you should be able to create any type of policies you or your organization feel are necessary.

LINQ developer center at http://msdn.microsoft.com/data/ref/linq or the huge catalog of LINQ examples at http://msdn2.microsoft.com/en-us/vbasic/bb737913.aspx.)

This is pretty much the minimum code you can have for the elapse handler. Notice that you first Stop() the timer, perform whatever actions you want within the elapsed event, and then Start() the timer again. Doing this prevents any problems that might happen if the code takes longer than the timer elapse interval. If you are 100 percent certain that the process time of the handler will be less than the timer s elapsed time, then you can skip the Stop() and Start() steps. Now, why is this code of the OnStart() handler redundant If you have the AutoLog feature set to true, the Windows service will also automatically log this event. Because of this, when you finally get to run this example, you will have two system log events created, one automatically and this one that you created earlier. This handler is the only one to take an argument, in this case, a string array of values that is sent to it from the Start command. If you use the Services application found in the Administrative Tools, you can add the arguments using the General tab on the Windows service s Properties window. To do this, select Windows service in the Services application, and then right-click and select the Properties menu item. This should present the Properties dialog window as shown in Figure 14-4. From here, just add the arguments to the Start Parameters text box.

Needless to say, this is a welcome conversion tool. In addition to this, you can migrate from Rational ClearQuest. The process of migration is an extensive process that needs to be carefully planned. We have not included this process here, since Microsoft has done a very thorough job of explaining it in the MSDN documentation. We just wanted to let you know that you could do it!

LINQ revolves around the IEnumerable(Of T) interface. No matter what data source you use, every LINQ expression returns some object that implements IEnumerable(Of T). Because IEnumerable(Of T) extends IEnumerable, you can bind it in a WPF window just as you bind an ordinary collection: lstProducts.ItemsSource = matches That said, there are a few quirks worth considering. The following sections give you the details.

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