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The properties of the Process class provide information about the underlying system processes. The first call to a Process property populates the instance with information about the system process, representing a snapshot of the process at the time the property was accessed; this information is cached in the Process instance and won't be updated until the Refresh method is called. Table A-5 provides a summary of the commonly used Process properties. Other properties provide details about the resources that the system process is using; consult the .NET documentation for complete details.

// Version 2 protected void OnNewMail(NewMailEventArgs e) { EventHandler<NewMailEventArgs> temp = NewMail; if (temp != null) temp(this, e); }

By default, the DNS Server service acts as a caching-only server. Caching-only servers thus require little or no configuration. To install a caching-only DNS server, complete the following steps: 1. Install the DNS server role on the server computer. 2. Do not configure the DNS server (as you might normally) to load any zones. 3. Verify that server root hints are configured or updated correctly.

New zones contain only two resource records: the start-of-authority (SOA) record cor responding to the zone and a name server (NS) record corresponding to the local DNS server created for the zone. After you create a zone, you must add additional resource records to it. Although some records might be added automatically, others (such as MX and CNAME records) need to be added manually.

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The thinking here is that a reference to NewMail is copied into a temporary variable, temp, which refers to the chain of delegates at the moment the assignment is performed . Now, this method compares temp and null and invokes temp, so it doesn t matter if another thread changes NewMail after the assignment to temp . Remember that delegates are immutable and this is why this technique works in theory . However, what a lot of developers don t realize is that this code could be optimized by the compiler to remove the local temp variable entirely . If this happens, this version of the code is identical to the first version, so a NullReferenceException is still possible . To really fix this code, you should rewrite OnNewMail like this:

Description Gets the base priority of the system process; individual threads of the process can be prioritized independently but use the base priority initially. Gets the unique ID of the system process. Id MachineName Gets the name of the machine the system process is running on. MainWindowHandle Gets the handle to the main window for processes running on the local machine; if the process doesn't have a main window, 0 (zero) is returned. Gets the name of the system process. ProcessName On multiprocessor machines, ProcessorAffinity gets or sets the ProcessorAffinity processors on which threads of the associated process will be scheduled to run; a bit mask is used to specify the processors that can be used.

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// Version 3 protected void OnNewMail(NewMailEventArgs e) { EventHandler<NewMailEventArgs> temp = Thread.VolatileRead(ref NewMail); if (temp != null) temp(this, e); }

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The call to VolatileRead forces NewMail to be read at the point of the call and the reference really has to be copied to the temp variable now . Then, temp will be invoked only if it is not null . Unfortunately, it is impossible to write the code as shown because there isn t a generic overload of the VolatileRead method . However, there is a generic overload of Interlocked.CompareExchange, which you can use:

To add a resource record for a zone manually, right-click the zone icon in the DNS console and from the shortcut menu, select the appropriate resource record you want to create, as shown in Figure 4-7.