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For example, if you hold down Shift and click the Category column followed by the Price column, products will be sorted into alphabetical category groups, and the items in each category group will be ordered by price It s possible to exercise some control over the DataGrid sorting process, depending on how much effort you re willing to make (and how much code you re willing to live with) Here are your options: SortMemberPath Every column provides the SortMemberPath property, which allows you to specify the property in the bound data object that s used for sorting If SortMemberPath isn t set, the column is sorted using the bound data, which makes perfect sense However, if you have a DataGridTemplateColumn, you need to use SortMemberPath because there s no Binding property to provide the bound data If you don t, your column won t support sorting ICollectionView.

An effective message system must also support transaction management Transaction management defines how several instances of queue readers are coordinated against one queue To make this clearer, let s assume a scenario where an order-entry application sends order request messages to a queue Two kinds of request messages are involved: A message with the order header Several messages with the order line items As soon as the first message arrives at the queue, a queue reader is instantiated, which takes the new order header message from the queue and processes it The queue reader inserts a new row in an order table and commits the transaction Then, a reader processes the line-item messages and also inserts new rows in the database.

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Each dashboard user can be given permission to add comments to the cells in a PPS scorecard. These comments are then available to other users when they view that scorecard. The comment functionality also uses the term annotation. Technically, a scorecard cell can have one annotation and each annotation can have multiple comments.

It s beyond the scope of this chapter, but you can create a custom class that implements ICollectionView and provides sorting You can then bind an instance of that class to the DataGrid A custom template If you don t like the arrows that indicate when a sort order has been applied (or you want to add a glitzier animation), you need to use the DataGridColumnHeaderStyle property to apply a new template You ll find three key states: Unsorted State (when no sorting is applied), SortedAscending State (when the column is first sorted), and SortedDescending State (when the column header is clicked twice, and the sort order is reversed) Customize these to plug in your own visuals..

Everything seems OK, but what happens when an administrator configures more than one queue reader to listen for new messages In this case, the order header and the line-item messages can be processed in parallel, with the possibility that an attempt could be made to insert a line item before the order header This will raise an exception, because it violates referential integrity between an order header and its line items One possible way around this is to process messages in the correct order Service Broker solves this problem through a feature called conversation group locking Conversation group locking groups related messages for reading by multiple readers to prevent data integrity problems caused by processing related messages simultaneously on different threads During the design of your Service Broker application, you must make sure that related messages are placed into the same conversation group.

This section of the page contains a checkbox that can be used to enable the annotation feature within the PPS instance. There is also a setting that limits the number of annotations that can exist on a single scorecard. The default is 1,000 annotations per scorecard. There is also a Delete Comments by Date button that displays the dialog shown in Figure 6 15. This dialog can be used to start a background job that will clean up comments older than a given date, which can use useful if it becomes necessary to reclaim space in the SQL database associated with this PPS instance. The name of this database is based on the name of the PPS application and a unique GUID, like PPS Application_d6430dcfa6de4086a84dcb1b0c39f78e .

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