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The field _x is more formally called a backing store. Your class, in this example, provides the backing store for the X property. Both WF and Windows Presentation Foundation (WPF), however, quite often need access to your class s properties. WPF will need to determine the sizing and spacing of controls in a container so that things will be optimally rendered. WF needs dependency properties to facilitate activity binding, which is a process that allows different activities to reference (and be bound to) the same property. The WF ActivityBind class facilitates this for you. To facilitate the chaining and binding of properties, the backing store for your class properties can be shifted from your class down to the .NET runtime itself. The property data is still stored it s just that .NET stores it for you. In a sense, it s like having a room full of lockers. You didn t build the building and install the lockers, but you can use them when you need to. In this case, you register your locker request with .NET, and .NET provides you with the locker and the means to access what s inside the locker. These lockers, so to speak, are called DependencyProperties.

Monitoring disk usage helps to balance the load of servers. When monitoring disk performance, log the performance data to another disk or computer to prevent it from skewing the data for the disk you are testing. Note Disk counters are permanently enabled in Windows Small Business Server and Microsoft Windows XP To enable disk counters for Microsoft Win. dows 2000 or Windows NT, use the Diskperf command. (Type diskperf - at a command prompt for additional information.)

The following list shows the minimum recommended counters for monitoring the server s disk performance for possible bottlenecks:

4

Released in 1996, the X.509 version 3 format introduced extensions to address the problems associated with matching the Issuer Unique ID with the Subject Unique ID, as well as other certificate-validation issues. An X.509 version 3 certificate can contain one or more certificate extensions. (See Figure 2-3.)

number of system requests that are waiting for disk access. This number should remain steady at no more than 1.5 to 2 times the number of spindles that make up the physical disk. Most disks have one spindle. The exception is Redundant Array of Independent Disks (RAID) devices, which usually have more than one spindle. You need to observe this value over several intervals because it is an instantaneous counter.

To revisit the bit of code I provided earlier, this code uses a DependencyProperty as the backing store for X:

drives are by displaying the percentage of time that a drive is active. If the value of this counter rises to more than 90 percent or if you are using a RAID device, check the PhysicalDisk\ Current Disk Queue Length (all instances) counter to see how many disk requests are queued for disk access. RAID devices can cause the PhysicalDisk\ % Disk Time value to exceed 100 percent and thus give an incorrect reading.

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class MyClass { public static DependencyProperty XProperty = DependencyProperty.Register("X", typeof(System.Int32), typeof(MyClass)); ... public Int32 X { get { return ((Int32)(base.GetValue(MyClass.XProperty))); } set { base.SetValue(MyClass.XProperty, value); } } }

disk takes to fulfill a request. A high value might indicate that the disk controller is continually trying to access the disk as a result of failures. For most systems, a value of 0.3 seconds or higher indicates a high average disk transfer time. To monitor possible usage problems, use these counters:

Part I:

To register to use a locker, you call the static Register method on the DependencyProperty object. To access the locker, you use GetValue and SetValue instead of writing to the field in your class directly. These methods access the underlying backing store, giving both you and the .NET runtime (or the workflow runtime, as the case may be) access to your activity properties. Visual Studio will insert a lot of code like this for you as you use WF. When we create our own custom activity in 13, we ll write this sort of code ourselves as well.

of bytes that are transferred from or to a disk during read or write operations. A value less than 20 KB indicates that an application is accessing the disk drive inefficiently.

show that actual usage is near the specified transfer rate of the physical disks, consider reducing the server s workload or upgrading to a RAID setup. Under the Hood Tuning and Upgrading Tips for Disks If you are experiencing problems with disk performance, try the following solutions: