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Returns true if the UI of the associated process is capable of responding to user input; if the UI is unresponsive, false is returned. Gets a System.IO.StreamReader through which the standard error output can be read from the associated process. The process must be configured to redirect error messages when it is created or an exception is thrown; see "Creating New Processes" earlier in this section for details. Similar to StandardError but provides a System.IO.StreamWriter for writing standard input to the system process. Similar to StandardError but provides access to the standard output of a process. Returns a System.Diagnostics.ProcessStartInfo instance that contains the information used to create the system process; the "Creating New Processes" topic earlier in this section contains an overview of the ProcessStartInfo class. Gets a System.DateTime instance containing the time the system process was started.

To add a resource record to a zone, complete the following steps: 1. Open the DNS console. 2. In the console tree, right-click the applicable zone and select Other New Records. The Resource Record Type dialog box appears. 3. In the Select A Resource Record Type list box, select the type of resource record you want to add. 4. Click Create Record. 5. In the New Resource Record dialog box, enter the information needed to com plete the resource record. 6. After you specify all of the necessary information for the resource record, click OK to add the new record to the zone. 7. Click Done to return to the DNS console.

// Version 4 protected void OnNewMail(NewMailEventArgs e) { EventHandler<NewMailEventArgs> temp = Interlocked.CompareExchange(ref NewMail, null, null); if (temp != null) temp(this, e); }

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Resource records appear in varying formats, depending on the context in which they are used. For example, when lookups and responses are made using DNS, resource records are represented in binary form in packets. In the DNS console, resource records are represented graphically so that they can be viewed and modified easily. However, at the source in the zone database files resource records are represented as text entries. In fact, by creating resource records in the DNS console, you are auto matically adding text entries to the corresponding zone s database file.

Two methods of the Process class allow the current thread to synchronize with the state of a given process. The WaitForExit method blocks the current thread indefinitely until the associated process terminates. For processes that have user interfaces, the WaitForInputIdle method blocks the current thread until the process enters an idle state. Both methods provide overloads where a timeout period is specified, after which the method returns false and the blocked thread continues. The Process class also provides an event mechanism to notify listeners of process termination. To enable events, the Process.EnableRaisingEvents property must be set to true. An event handler can then be registered with the Process.Exited event that will be called when the associated process is terminated.

Here, CompareExchange changes the NewMail reference to null if it is null and does not alter NewMail if it is not null . In other words, CompareExchange doesn t change the value in NewMail at all, but it does return the value inside NewMail in an atomic, thread-safe way . See 28, Primitive Thread Synchronization Constructs, for more information about the Thread.VolatileRead and Interlocked . CompareExchange methods . While the fourth version of this code is the best, technically correct version, you can actually use the second version because the just-in-time (JIT) compiler is aware of this pattern and it knows not to optimize away the local temp variable . Specifically, all of Microsoft s JIT compilers respect the invariant of not introducing new reads to heap memory and therefore, caching a reference in a local variable ensures that the heap reference is accessed only once . This is not documented and, in theory, it could change, which is why you should use the fourth version . But in reality, Microsoft s JIT compiler would never embrace a change that would break this pattern because too many applications would break .1 In addition, events are mostly used in single-threaded scenarios (Windows Forms, Windows Presentation Foundation, and Microsoft Silverlight) and so thread safety is not an issue anyway . It is very important to note that due to this thread race condition, it is also possible that a method will be invoked after it has been removed from the event s delegate chain . As a convenience, you could define an extension method (as discussed in 8, Methods ) that encapsulates this thread-safety logic . Define the extension method like this:

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public static class EventArgExtensions { public static void Raise<TEventArgs>(this TEventArgs e, Object sender, ref EventHandler<TEventArgs> eventDelegate) where TEventArgs : EventArgs { // Copy a reference to the delegate field now into a temporary field for thread safety EventHandler<TEventArgs> temp = Interlocked.CompareExchange(ref eventDelegate, null, null); // If any methods registered interest with our event, notify them if (temp != null) temp(sender, e); } }

In these zone files, resource records have the following syntax: