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Adding a sequential workflow project to the WorkflowHost solution 1. If Visual Studio isn t running, start Visual Studio 2005 as you did in the previous chapters. If the WorkflowHost project isn t loaded, select it from the Visual Studio Recent Projects menu, which you can access from the main File menu. Visual Studio will grind for a moment as it reloads WorkflowHost for editing. 2. We could, if we wanted, add a workflow-based class directly into our WorkflowHost project. This is precisely what Visual Studio did when it created the PCodeFlow application in 1. Instead of simply adding a workflow component to our existing WorkflowHost application, however, let s add an entirely new workflow project to our solution. To do that, select Add and then New Project from the Visual Studio File menu. This will activate the Add New Project dialog box.

Notes on the preceding table:

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Many ASP.NET applications query some data out of a database, cache it, and then manage to serve a report to the user. Binding the report to the data in the cache will both reduce the time required to load each report and minimize traffic to and from the database. What s the problem, then With a report built from the cache, if the data displayed is modified in the database, users will get an out-of-date report. If updates occur at a known or predictable rate, you can set an appropriate duration for the cached data so that the report gets automatically refreshed at regular intervals. However, this contrivance just doesn t work if serving live data is critical for the application or if changes occur rarely and, worse yet, randomly. In the latter case, whatever duration you set might hit the application in one way or the other. A too-long duration creates the risk of serving outdated reports to end users which, in some cases, could undermine the business; a too-short duration burdens the application with unnecessary queries. A database dependency is a special case of custom dependency that consists of the automatic invalidation of some cached data when the contents of the source database table changes. In ASP.NET, you find an ad hoc class SqlCacheDependency that inherits CacheDependency and supports dependencies on SQL Server tables. More precisely, the class is compatible with SQL Server 2005 and later.

802.1x and its associated protocols are an attempt to increase the security of networks before layer 3 protocols (such as IP) are set up. The technology is not specific to 802.11 and can be used on Ethernet, Token Ring, and so on. 802.1x is a layer 2 protocol that can be used for a number of operations. At the time of this writing, 802.1x details for 802.11 are still in draft form, but the basic functionality is not likely to change.

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If a digital media application cannot play MIDI files, start by reviewing the troubleshooting guidelines in Common Problems with Playing Digital Media earlier in this chapter. If MIDI files do not play, the cause of the problem might be that a MIDI driver is not installed. To see if a MIDI driver is installed 1. In Control Panel, click Sounds, Speech, and Audio Devices, and then click Sounds and Audio Devices. 2. On the Hardware tab, in the list of devices, select your MIDI device, and then click Properties. 3. Click the Driver tab to view details about the driver or to update, roll back, or uninstall the driver. 4. If no driver is installed, read the manufacturer s instructions to install a driver for the device.

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