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byte[] msgAsByteArray = Encoding.Default.GetBytes(msg); // Write byte[] to file. fStream.Write(msgAsByteArray, 0, msgAsByteArray.Length); // Reset internal position of stream. fStream.Position = 0; // Read the types from file and display to console. Console.Write("Your message as an array of bytes: "); byte[] bytesFromFile = new byte[msgAsByteArray.Length]; for (int i = 0; i < msgAsByteArray.Length; i++) { bytesFromFile[i] = (byte)fStream.ReadByte(); Console.Write(bytesFromFile[i]); } // Display decoded messages. Console.Write("\nDecoded Message: "); Console.WriteLine(Encoding.Default.GetString(bytesFromFile)); } Console.ReadLine(); } This example populates the file with data, but it also punctuates the major downfall of working directly with the FileStream type: it demands to operate on raw bytes. Other Stream-derived types operate in a similar manner. For example, if you wish to write a sequence of bytes to a region of memory, you can allocate a MemoryStream. Likewise, if you wish to push an array of bytes through a network connection, you can use the NetworkStream class (in the System.Net.Sockets namespace). As mentioned previously, the System.IO namespace provides several reader and writer types that encapsulate the details of working with Stream-derived types.

N ote If you are familiar with design patterns in general, you are probably aware that to reduce the lookup

The predefined accounts you can select are as follows: Network Service: This is a restricted account with much fewer privileges than the Local System account. This account is intended to be used for applications that require access to the network and need to be accessed from other machines. Local Service: This account is more restricted than the Network Service account and intended to be used for services that don t require additional network access. Services running on this account don t have the permission for accessing other network resources; they can access local resources only.

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The StreamWriter and StreamReader classes are useful whenever you need to read or write characterbased data (e.g., strings). Both of these types work by default with Unicode characters; however, you can change this by supplying a properly configured System.Text.Encoding object reference. To keep things simple, assume that the default Unicode encoding fits the bill. StreamReader derives from an abstract type named TextReader, as does the related StringReader type (discussed later in this chapter). The TextReader base class provides a limited set of functionality to each of these descendents; specifically it provides the ability to read and peek into a character stream. The StreamWriter type (as well as StringWriter, which you will examine later in this chapter) derives from an abstract base class named TextWriter. This class defines members that allow derived types to write textual data to a given character stream.

Local System: The well-known Local System account, of course, still exists. But we recommend never, ever using this account for web applications of any type, as this is the most powerful account of a system. It can perform any action on the local system, so any application running under this account can also do this. Basically, your strategy should always be running applications with a least-privileged account this means an account that does not have more privileges than the application actually should need. Therefore, if someone is able to break (hack) the application, the damage will be limited to a minimum, as the account under which the application is running is restricted. The other possibility you have is creating your own identity and configuring this identity with the application pool. This gets interesting if you have an application with specific permissions such as accessing only specific databases or accessing the Windows certificate store for encrypting data based on X509 certificates, for example. In that case, you can create a Windows user account that has these permissions and then configure the application pool with this account. As you can see in Figure 18-19, you can select the option Configurable and then specify your own Windows account for the application pool. But this Windows account, of course, has to have at least the same permissions as the Network Service account has. Fortunately, Microsoft has prepared a Windows group that will be installed with IIS 6.0 on Windows Server 2003 machines that have those permissions the so-called IIS Worker Process Group (IIS_WPG). Any user account intended to be used as application pool user has to be a member of this worker process group, as shown in Figure 18-20.

To aid in your understanding of the core writing capabilities of the StreamWriter and StringWriter classes, Table 20-8 describes the core members of the abstract TextWriter base class. Table 20-8. Core Members of TextWriter

Close()

When you open the properties for this group, you will see that Network Service itself is a member of this group and therefore gets all the necessary permissions to be used as the identity for application pools. The group grants the user special permissions such as the permission for running as a service process in background. It also grants access to the necessary directories such as the temporary ASP .NET files stored in c:\WINDOWS\Microsoft.NET\Framework\[Version]\Temporary ASP.NET Files, where ASP.NET stores the dynamically compiled version of the different pages.

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