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Clearly, none of the earlier solutions are ideal. What you need is a way to store XML data in its native form while also providing indexing and querying capabilities on any part of the data. This is exactly what SQL Server 2005 provides with the new XML native type and an integrated XML query language called XQuery.

Hark back to 5 when we were building our first activity. Remember how I said it was really nothing more than a .NET custom control Guess what Debugging activities is exactly the same as debugging any other custom control. Set your breakpoint, run the workflow that contains your activity, and the runtime will pause when it gets to your breakpoint.

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It turns out that a properly constructed business object can move around the network from machine to machine with almost no effort on your part The NET Framework itself handles the details, and you can focus on the business logic and data By properly designing and implementing mobile business objects, you allow the NET Framework to pass your objects across the network by value, thereby copying them automatically from one machine to another This means that with little extra code, you can have your business logic and business data move to the machine where the Interface Control layer is running and then shift to the machine where the Data Access layer is running when data access is required At the same time, if you re running the Interface Control and Data Access layers on the same machine, then the NET Framework won t move or copy your business objects.

They re used directly by both tiers with no performance cost or extra overhead You don t have to do anything to make this happen, either NET automatically detects that the object doesn t need to be copied or moved and thus takes no extra action The Business layer becomes portable, flexible, and mobile, and it adapts to the physical environment in which you deploy the application Because of this, you re able to support a variety of physical n-tier architectures with one code base, whereby your business objects contain no extra code to support the various possible deployment scenarios What little code you need to implement to support the movement of your objects from machine to machine will be encapsulated in a framework, leaving the business developer to focus purely on the development of business logic..

At this point, the extender control s basic plumbing is complete. It gets to choose which controls to extend, and maintains a list of all the controls it does extend, along with the ApplyAuthorization property value for each of those controls. When the UI developer wants to enforce authorization rules for the whole form, she can do so by triggering the ReadWriteAuthorization control. To allow this, the control implements a ResetControlAuthorization() method. This method is Public, so it can be called by code in the form itself. Typically, this method will be called immediately after a business object has been loaded and bound to the form, or immediately after the user has logged into or out of the application. It is also a good idea to call it after adding a new business object to the database, since some objects will change their authorization rules to be different for an old object than for a new object. You ll see how this works in 9 in the Windows Forms UI for the sample application. The ResetControlAuthorization() method loops through all the items in the list of extended controls. This is the Dictionary object maintained by Get/SetApplyAuthorization, as discussed earlier. The ApplyAuthorization value for each control is checked, and if it is true, then authorization rules are applied to that control:

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