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# of current recognized threads The number of threads that were created outside the common language runtime (for example, in a COM component) that the runtime has recognized. contention rate/sec Rate at which threads in the runtime fail to acquire a managed lock for example, when reaching a SyncLock block. A high number for this counter is a symptom that the application isn t well designed for multithread operations. total # of contentions The total number of times threads in the common lan guage runtime have failed to acquire a managed lock. current queue/sec The average number of threads waiting to acquire a lock; a high value means that most threads spend most of their time waiting for a lock to become available.

Figure 30-16. The Envelopes And Labels dialog box enables you to create and print individ ual envelopes and labels.

Table 5-1

Figure 12-4 The Performance utility lets you visualize several statistics regarding common language runtime threads.

If you re working with an open document that has an Address Block inserted (or a default address you ve entered yourself), the address will be shown automatically in the Envelopes And Labels dialog box.

The Envelopes tab includes a number of quick options you can set before printing an enve lope. Here s an overview:

The meaning of some of these counters most notably, those related to contention and locks will become evident later in this chapter.

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System Privileges System. Processes have unlimited access to the computer. Administrative. Processes can install files to the Program Files folder and write to sensitive registry areas like HKEY_LOCAL_MACHINE. User. Processes can create and modify files in the user s Documents folder and write to user-specific areas of the registry, such as HKEY_CURRENT_USER. Most files and folders on a computer have a medium integrity level because any object without a mandatory label has an implied default integrity level of Medium. Untrusted. Processes can only write to low integrity locations, such as the Temporary Internet Files\Low folder or the HKEY_CURRENT_USER\Software\LowRegistry key.

Starts the print process, so make sure to set your other options and load the printer before clicking this button. Adds the envelope to the current document so that the envelope and document can be printed together. Closes the Envelopes And Labels dialog box without saving settings. Displays the Envelope Options dialog box so that you can choose the enve lope size and font specifications.

A thread is always terminated when an unhandled exception occurs. However, an exception on a secondary thread for example, a thread used by the garbage collector to call the Finalize method, a thread created with the Thread class, or a thread taken from the thread pool isn t fatal for the application (even if it might cause error mes sages to appear, depending on the type of current application). Only uncaught excep tions thrown by the main thread or an unmanaged thread for example, a thread running in COM objects called by a .NET assembly terminate the application.

To print an envelope, simply open the Envelopes And Labels dialog box and follow these steps:

Low IL resources that Internet Explorer in Protected Mode can access include:

address blocks, click Options. The Envelope Options dialog box appears. Choose the envelope size and font you want to use and click OK.

12:

envelope, click E-Postage Properties to set postage options and select the Add Elec tronic Postage check box to enable the feature for the current envelope.

You can get a notification when an unhandled exception is about to terminate a thread by trapping the UnhandledException event of the AppDomain object pointing to the current AppDomain. The event s second argument receives an UnhandledExceptionEventArgs object, which exposes two properties, ExceptionObject and IsTerminating. The former is of course the exception being thrown, but it returns an Object value, and you must cast it to an Exception variable before you can read the usual properties such as Message and StackTrace. The second property is True if the exception is fatal and will terminate the application: this is the case when the exception is thrown on the main thread (the thread that was created when the application began its execution) or on an unmanaged thread created outside the .NET runtime. The IsTerminating prop erty is False when the exception is thrown on a thread that you created yourself, a thread borrowed from the thread pool (for example, a thread that serves a timer), or the special thread that executes all Finalize methods. The following example shows how you can trap the UnhandledException event:

The History folder. The Cookies folder. The Favorites folder. The %userprofile%\AppData\Local\Microsoft\Windows\Temporary Internet Files\Low \ folder. The Windows temporary files folders. The HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry key.

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