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Most basic tests use a dedicated web server, a set of dedicated client machines that are interacting with your web server over a fast isolated network, and a load-generating tool that runs on each client. The load-generating tool automatically requests a steady stream of pages, simulating a heavy load. You might use a utility such as Microsoft s ACT (Application Center Test), which is included with some versions of Visual Studio, or the ASP favorite, WAST (Web Applications Stress Tool), which is available for free download from http://www.microsoft.com/technet/archive/itsolutions/intranet/downloads/ webstres.mspx. (With ACT, you can create tests directly in Visual Studio simply by adding the appropriate project type to your solution.) Note that if you try to test the server using a load-testing tool running from the same computer, you ll retrieve data that is much less accurate and much less useful. Both ACT and WAST simulate real-world conditions by continuously requesting pages through several connections simultaneously. You can configure how many requests are made at once and what files are requested. You can even use a wizard that records typical browser activity while you use the site and then replays it later. Most load-generating tools record some kind of report as they work. Both ACT and WAST create text summaries. Additionally, you can record results using Windows performance counters, which you ll examine in the next section.

6. Go back to the Source view, and duplicate the Web controls and binding expressions on the page. The ID properties will be changed automatically to default values, but you should change them to lblName2, lblCountry2, lnkEmail2, and lnkWebsite2. 7. Change the binding expressions so that they bind to columns from a different row in the table. This is as simple as changing the Rows index, as this example shows: <asp:Label ID="lblName2" runat="server"> Name: DataBinder.Eval (myDataSet.Tables["Manufacturer"].Rows[4], "[ManufacturerName]") </asp:Label> <br /> Country: <asp:Label ID="lblCountry2" runat="server" Text='<%# DataBinder.Eval (myDataSet.Tables["Manufacturer"].Rows[4], "[ManufacturerCountry]") %>'> </asp:Label> 8. Save the page, and then view it again (see Figure 6-5). You ll see that the DataTable has no problem. The DataReader would, of course, choke on this. The only way to work at random with a table with a DataReader is to keep rebuilding it.

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Windows performance counters are the basic unit of measurement for gauging the performance of your application. You can add or configure counters from a testing utility such as WAST, or you can monitor performance directly from the system Performance dialog box. To do so, choose Settings Control Panel Administrative Tools Performance from the Start menu. Figure 26-1 shows the Performance dialog box. By default, you ll see performance counters only for measuring basic information such as the computer s CPU and disk drive use. However, ASP.NET installs much more useful counters for tracking web application performance. To add these counters, rightclick the counter list at the bottom of the Performance window, and choose Properties. You can configure numerous options (such as changing the appearance of the graph and logging information to a report), but the most important tab is Data, which allows you to add and remove counters from the current list. To start, remove the default counters, and click Add to choose more useful ones, as shown in Figure 26-2.

1. Open BalloonShop.master in Source View and add the following JavaScript function inside the <HEAD> element: <head runat="server"> <title>BalloonShop</title> <script language="JavaScript">

You ll notice several important features in the Add Counters dialog box. First, you can specify a computer name in other words, you can monitor the performance of a remote computer. Monitoring the web server s performance on a client computer is ideal, because it ensures that the act of monitoring doesn t have as much of an effect on the server. The next important feature of this window is the performance object, which allows you to choose a performance counter category. You can use dozens of different categories. For ASP .NET, you ll find four main categories. The ASP .NET category provides information about the overall performance of ASP.NET, while the ASP.NET Applications category provides information about a single specified web application. Also, two similar categories include the version number (such as ASP .NET [Version] and ASP .NET Apps [Version]). These categories provide the same list of counters as the corresponding categories that don t indicate the version. This design supports the side-by-side execution features of .NET, which allow you to install two (or more) versions of the .NET Framework at the same time and use them to host different websites. In this case, you would find one ASP.NET [Version] category and one ASP.NET Apps [Version] category for each version of ASP.NET that is installed on your server. The ASP.NET and ASP.NET Application categories automatically map to the most recent version. Table 26-1 lists some of the most useful counter types by category and name. The asterisked rows indicate counters that can help you diagnose a problem, while the other rows represent counters that are always useful.

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