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Most Java developers have some basic experience with the JDBC However, some readers may be coming from other languages, such as ActionScript, and may not be familiar with it, so we ll discuss it a bit Plain old JDBC allows connecting to a database from within Java Basically, JDBC is a framework that provides services to the Java developer to write programs that access information stored in databases, spreadsheets, and files A database that another program links to is called a data source Many data sources, including products produced by Microsoft and Oracle, already use a standard called Open Database Connectivity (ODBC) Many legacy C and Perl programs use ODBC to connect to data sources ODBC consolidated much of the commonality of various database management systems, and JDBC builds on this and increases the level of abstraction.

Figure 3-2. Supplying arguments at the command line As an alternative to the standard for loop, you may iterate over an incoming string array using the C# foreach keyword. Here is some sample usage. // Notice you have no need to check the size of the array when using "foreach". static int Main(string[] args) { ... // Process any incoming args using foreach. foreach(string arg in args) Console.WriteLine("Arg: {0}", arg); Console.ReadLine(); return -1; } Finally, you are also able to access command-line arguments using the static GetCommandLineArgs() method of the System.Environment type. The return value of this method is an array of strings. The first index identifies the name of the application itself, while the remaining elements in the array contain the individual command-line arguments. Note that when using this approach, it is no longer necessary to define Main() as taking a string array as the input parameter, although there is no harm in doing so. static int Main(string[] args) { ... // Get arguments using System.Environment. string[] theArgs = Environment.GetCommandLineArgs(); foreach(string arg in theArgs) Console.WriteLine("Arg: {0}", arg); Console.ReadLine(); return -1; }

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You can access some additional information about the currently authenticated user by casting the general identity object to a WindowsIdentity object. WindowsIdentity provides a number of additional members, as described in Table 22-2. Table 22-2. Additional Members of the WindowsIdentity

Of course, it is up to you to determine which command-line arguments your program will respond to (if any) and how they must be formatted (such as with a - or / prefix). Here we simply passed in a series of options that were printed directly to the command prompt. Assume, however, you were creating a new video game and programmed your application to process an option named -godmode. If the user starts your application with the flag, you know he is, in fact, a cheater and you can take an appropriate course of action.

This property returns True if the user is anonymous (has not been authenticated). This property returns True if the user is using a Guest account. Guest accounts are designed for public access and do not confer many privileges. Returns True if the user account has the Act As Part of the Operating System permission, which means it is a highly privileged system account. Retrieves a collection that contains instances of SecurityIdentifier, which returns the SID values for the groups the user is in. Returns the operating system token for the identity. Gets the SID for the token owner. Gets the user s SID. For example, you can use this SID if you want to modify permissions for this user on ACLs through the classes provided in the System.Security.AccessControl namespace. This method instructs ASP.NET to run the following code under the corresponding Windows account. You ll learn much more about impersonation in the next section. This Shared method creates a WindowsIdentity that represents an anonymous user. This Shared method creates a WindowsIdentity that represents the identity tied to the current security context (the user whose identity the current code is running under). If you use this method in an ASP.NET application, you ll retrieve the user account under which the code is running, not the user account that was authenticated by IIS and is provided in the User object.

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