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Begin this example by creating a new Windows Forms application named MultitabledDataSetApp. The GUI is simple enough. In Figure 22-11, you can see three DataGridView widgets (dataGridViewInventory, dataGridViewCustomers, and dataGridViewOrders) that hold the data retrieved from the Inventory, Orders, and Customers tables of the AutoLot database. In addition, the initial Button (named btnUpdateDatabase) submits any and all changes entered within the grids back to the database for processing using data adapter objects.

As you can see in Table 5-1, Spring tries to use similar patterns for the different data access libraries. Usually for each data access library supported by Spring, there is a template and a DAO support class.

Here s a simple example that tests whether the user is in a predefined Windows role: If Request.IsAuthenticated Then lblInfo.Text = "<b>Name: </b>" & User.Identity.Name Dim principal As WindowsIdentity = CType(User, WindowsPrincipal) lblInfo.Text &= "<br/><b>Power user </b>" lblInfo.Text &= principal.IsInRole(WindowsBuiltInRole.PowerUser).ToString() End If Note that you must cast the User object to a WindowsPrincipal in order to access this Windowsspecific functionality. Figure 22-8 shows the result.

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:success echo This application has succeeded! echo return value = %ERRORLEVEL% goto end :end echo All Done. At this point, open a Visual Studio 2010 command prompt and navigate to the folder containing your executable and new *.bat file. Execute the batch logic by typing its name and pressing the Enter key. You should find the output shown in Figure 3-1, given that your Main() method is returning -1. Had the Main() method returned 0, you would see the message This application has succeeded! print to the console.

Figure 3-1. Capturing an application s return value via a batch file Again, a vast majority (if not all) of your C# applications will use void as the return value from Main(), which, as you recall, implicitly returns the error code of zero. To this end, the Main() methods used in this text (beyond the current example) will indeed return void (and the remaining projects will certainly not need to make use of batch files to capture return codes).

Table 22-1 lists all the possible roles provided through the WindowsBuiltInRole enumeration. You can also test for membership with any arbitrary group you ve created. 23 discusses this technique. Table 22-1. Values for the WindowsBuiltInRole Enumeration

Now that you better understand the return value of the Main() method, let s examine the incoming array of string data. Assume that you now wish to update your application to process any possible commandline parameters. One way to do so is using a C# for loop. (Note that C# s iteration constructs will be examined in some detail near the end of this chapter.) static int Main(string[] args) { ... // Process any incoming args. for(int i = 0; i < args.Length; i++) Console.WriteLine("Arg: {0}", args[i]); Console.ReadLine(); return -1; }

AccountOperator Administrator BackupOperator Guest PowerUser PrintOperator Replicator SystemOperator User

Here you are checking to see whether the array of strings contains some number of items using the Length property of System.Array. As you ll see in 4, all C# arrays actually alias the System.Array class and therefore share a common set of members. As you loop over each item in the array, its value is printed to the console window. Supplying the arguments at the command line is equally simple, as shown in Figure 3-2.

Users with the special responsibility of managing the user accounts on a computer or domain. Users with complete and unrestricted access to the computer or domain. Users who can override certain security restrictions only as part of backing up or restoring operations. Like the User role but even more restrictive. Similar to Administrator but with some restrictions. Like a User but with additional privileges for taking control of a printer. Like a User but with additional privileges to support file replication in a domain. Similar to Administrator but with some restrictions. Generally, system operators manage a computer. Users are restricted accounts that are prevented from making systemwide changes.

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