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Now the list will create a separate entry for each DataRow object in the DataTableRows collection To determine what content is shown in the list, you need to set DisplayMemberPath property with the name of the field you want to show or use a data template (as described in 17) The nice aspect of this example is that once you ve changed the code that fetches your data, you don t need to make any more modifications When an item is selected in the list, the Grid underneath grabs the selected item for its data context The markup you used with the ProductList collection still works, because the property names of the Product class match the field names of the DataRow Another nice feature in this example is that you don t need to take any extra steps to implement change notifications.

s Caution Microsoft recommends that policies be installed on the local machine. If this is not done, you will have to allow full trust of assemblies residing on remote machines, which, in general, is not a secure practice.

Nearly any code you want can be placed in the OnStart() handler so long as it takes less than 30 seconds to execute (and your security context has the privileges to run it) Here s a simple and possibly somewhat redundant example of the OnStart() in action.

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That s because the DataView class implements the IBindingList interface, which allows it to notify the WPF infrastructure if a new DataRow is added or an existing one is removed However, you do need to be a little careful when removing a DataRow object It might occur to you to use code like this to delete the currently selected record: productsRowsRemove(CType(lstProductsSelectedItem, DataRow)) This code is wrong on two counts First, the selected item in the list isn t a DataRow object it s a thin DataRowView wrapper that s provided by the DataView Second, you probably don t want to remove your DataRow from the collection of rows in the table Instead, you probably want to mark it as deleted so that when you commit the changes to the database, the corresponding record is removed.

Here s the correct code, which gets the selected DataRowView, uses its Row property to find the corresponding DataRow object, and calls its Delete() method to mark the row for upcoming deletion: CType(lstProductsSelectedItem, DataRowView)RowDelete() At this point, the scheduled-to-be-deleted DataRow disappears from the list, even though it s technically still in the DataTableRows collection That s because the default filtering settings in the DataView hide all deleted records You ll learn more about filtering in 17..

I also for grins and giggles added timer event code and code to dump out the args that were passed: virtual void OnStart(array<String^>^ args) override { eventLog1->WriteEntry("SimpleWinService Started"); if (args->Length == 0) eventLog1->WriteEntry("Empty args"); else { for each (String ^s in args) { eventLog1->WriteEntry(s); } } double interval = 10000; // 10 seconds - hard coded for simplicity // but could be passed as an argument this->timer = gcnew System::Timers::Timer(interval); this->timer->Elapsed += gcnew System::Timers::ElapsedEventHandler(this, &SimpleWinService::timer_Tick); this->timer->Start(); } As you can see, the example overrides the virtual handler provided by the Windows Service template, with a log to the system event log stating that the Windows service was started and a dump of the args using the system event log as well The code to create the timer is pretty easy Create a Timer with an interval of 10 seconds.

To install the policy, copy the assembly to your local machine (preferably, all assemblies that need to be downloaded to a developer s machine should be stored on a secure network share). Make the following entries in the registry: Key: HKLM\Software\Microsoft\VisualStudio\8.0\TeamFoundation\SourceControl\ Checkin Policies or HKCU\Software\Microsoft\VisualStudio\8.0\TeamFoundation\ SourceControl\Checkin Policies Type: Reg_sz Name: Policy Class (in this example, Check for Comments Policy) Data: Absolute path to the assembly

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