Previous versions of GridView and ListView selection behaviour operating in a potentially confusing way to the user. For example, if the third row was selected and then page 2 was selected, the third row on page 2 would also be selected. ASP.NET 4 fixes this by adding the EnablePersistedSelection and DataKeyNames properties to provide what MSDN calls "Persisted Selection".

To make selection work more as expected simple set EnablePersistedSelection="True" on the GridView or ListView and set the DataKeyNames property to the unique\primary key\property of the underlying databound object\row\etc.

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