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var titleSalesQuery = from title in titlesDs.Tables["titles"].AsEnumerable() where title.Field<int>("ytd_sales") > 3000 select title; DataTable dtAdvance = titleAdvQuery.CopyToDataTable(); DataTable dtSales = titleSalesQuery.CopyToDataTable(); IEnumerable<DataRow> advanceSales = dtAdvance.AsEnumerable().Intersect( dtSales.AsEnumerable(), DataRowComparer.Default); GridView1.DataSource = advanceSales.CopyToDataTable(); GridView1.DataBind();

You can see how it appears in Figure 4-15.

11-34

created of a standard developer workstation, including all the common developer tools, office applications, and so on. That image is loaded onto each developer s machine. Having standardized configurations helps to avoid a raft of problems associated with slightly different configuration settings, different versions of tools used, and so on. A standardized disk image also greatly streamlines setting up new machines compared to having to install each piece of software individually.

This query generates the following output:

Earlier versions of Windows Movie Maker included the option to import video content from videocassette recorders and other sources using analog capture devices . This capability is not available in Windows Vista . If you have video clips trapped in an analog format, you ll need to use third-party software to create a digital video file in a supported format and then import that file into Movie Maker . Most analog capture devices include software specifically designed to perform this task .

Figure 1-3. When a site administrator adds a new user, the administrator can choose the level of permission to assign the user.

C# supports extension methods only; it does not offer extension properties, extension events, extension operators, and so on . Extension methods (methods with this before their first argument) must be declared in non-generic, static classes . However, there is no restriction on the name of the class; you can call it whatever you want . Of course, an extension method must have at least one parameter, and only the first parameter can be marked with the this keyword . The C# compiler looks only for extension methods defined in static classes that are themselves defined at the file scope . In other words, if you define the static class nested within another class, the C# compiler will emit the following message: "error

When initialized for service, DNS servers running on Windows Server 2003 apply installation settings taken either from the boot information file, the Registry, or the Active Directory database. You can modify these settings on the Advanced tab of the server properties dialog box in the DNS console, as shown in Figure 5-27.

Lessons in this chapter:

All the main work for doing the assertion output, which includes finding the assertion controls on the page, is done by the ASPTraceListenerHandleOutput method, shown in Listing 3-4 My first attempt at writing the HandleOutput method was much more involved Although I could get the current IHttpHandler for the current HTTP request from the static HttpContextCurrentHandler property, I couldn't find a way to determine whether the handler was an actual SystemWebUIPage If I could figure out that it was a page, I could easily grind through and find any assertion controls on the page My original attempt was to write quite a bit of code by using the very cool reflection interfaces so that I could walk the derivation chains myself.

For example, the following C# code takes advantage of the using statement . This code is shorter than the code shown in the previous example, but the code that the compiler generates is identical to the code generated in the previous example .

As I was getting close to finishing around 500 lines of code, Jeff Prosise innocently asked if I had seen the is operator, which determines whether a run-time type of an object is compatible with a given type Developing my own is operator functionality was an interesting exercise, but it wasn't something I needed to do Once I had the Page object, I started looking for an AssertControl on the page I knew it could be embedded inside another control, so I used a little recursion to walk through everything Of course, when doing recursion, I needed to ensure I had a degenerative case or I could have easily ended up in an infinite recursion case For ASPTraceListenerFindAssertControl, I chose to take advantage of the very interesting out keyword, which allows you to pass a method parameter by reference but doesn't require you to initialize it.