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We’ll get to how these properties are populated shortly, but first we need to go back to the Bind Data method.

The original method shown above did not implement any sorting, but now that we have a place to store the Sort Expression and Sort Direction we need to change that.

We also need force databinding to occur when then page is loaded, which we’ll handle in Page_Load.

The required actions for paging to work are setting the new page index, setting the Data Source, and calling Data Bind (the last two through the Bind Data method).

Once we have a reference to the Text Box, we set the new last name and save the changes (through the Submit Changes method).

When a Bound Field is displaying data (not in edit mode), the appropriate text is added to the Text property of the appropriate cell.

The Grid View does know the events that should be used to implement them, so the exceptions shown above are thrown when you try to perform one of these operations, but you have implemented the appropriate event handler.

The example shown here is for a Grid View, but the same types of event handlers must be implemented in roughly the same way for other data controls including the Form View, Details View, and List View. This is the final Grid View markup, so you can see the event handlers we’re going to implement.

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The important point is not which of these two events call Bind Data, but one of them must or the Grid View will not be updated. When bound using a Data Source ID, the Grid View internally tracks the current Sort Expression and Sort Direction, and those are available through properties with the same names.

When you manually bind the Grid View, this tracking does not occur, so we must implement some mechanism for tracking those values.

We’re using Linq to SQL to pull data from our database and bind it to the Grid View.

We’ll revisit this method when we implement the sorting functionality.

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