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This is nice because during testing, you will discover problems quickly and the information you get with an unhandled exception (error message and stack trace) are usually enough to allow you to fix your code Of course, a lot of companies don t want their application to just terminate after it has been tested and deployed and so a lot of developers insert code to catch SystemException, the base class of all exception types However, the problem with catching SystemException and allowing the application to continue running is that state may be corrupted Earlier in this chapter, I showed an Account class that defines a Transfer method whose job is to transfer money from one account to another account .

address space . This ensures that code in one application cannot access code or data in use by another application . Process isolation prevents security holes, data corruption, and other unpredictable behaviors from occurring, making Windows and the applications running on it robust . Unfortunately, creating processes in Windows is very expensive . The Win32 CreateProcess function is very slow, and Windows requires a lot of memory to virtualize a process s address space . However, if an application consists entirely of managed code that is verifiably safe and doesn t call out into unmanaged code, there are no problems related to running multiple managed applications in a single Windows process . And AppDomains provide the isolation required to secure, configure, and terminate each of these applications .

An Internet VPN solution based on PPTP or L2TP/IPSec meets all these basic requirements and takes advantage of the broad availability of the Internet. Other solutions, including IPSec tunnel mode (IPSec TM), meet only some of these requirements, but they remain useful for specific situations. The remainder of this chapter discusses VPN concepts, protocols, and components in greater detail.

What if, when this Transfer method is called, it successfully subtracts money from the from account and then throws an exception before it adds money to the to account If calling code catches System Exception and continues running, then the state of the application is corrupted: both the from and to accounts have less money in them then they should Since we are talking about money here, this state corruption wouldn t just be considered a simple bug, it would definitely be considered a security bug If the application continues running, it will attempt to perform more transfers to and from various accounts and now state corruption is running rampant within the application ..

Implement a hardware security module You should do this only if your company s secu-

public delegate TResult Func<T, TResult>(T arg);

Each remote computer that connects to a remote access server is automatically pro vided with an Internet Protocol (IP) address during the PPP connection establishment process. The remote access server obtains the IP addresses allocated to remote access clients either from an existing DHCP server or from a static range of IP addresses. You control how IP addresses are allocated in one of two places: the IP Address Assignment page of the Routing And Remote Access Server Setup Wizard, as shown in Figure 10-2, or the IP Address Assignment area of the server s IP properties in Routing And Remote Access, as shown in Figure 10-3.

public partial class UseUpdateProgressControl : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void ButtonLongOperation_Click(object sender, EventArgs e) { // Put thread to sleep for five seconds System.Threading.Thread.Sleep(5000); }

As you know, when the just-in-time (JIT) compiler compiles the Intermediate Language (IL) for a method, it sees what types are referenced in the IL code . Then at runtime, the JIT compiler uses the assembly s TypeRef and AssemblyRef metadata tables to determine what assembly defines the type being referenced . The AssemblyRef metadata table entry contains all of the parts that make up the strong name of the assembly . The JIT compiler grabs all of these parts name (without extension or path), version, culture, and public key token concatenates them into a string, and then attempts to load an assembly matching this identity into the AppDomain (assuming that it s not already loaded) . If the assembly being loaded is