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The FormViewDeletedEventArgs.Keys property contains the values of the key fields listed in the FormView.DataKeyNames property of a System.Web.UI.WebControls.FormView control. Use the FormViewDeletedEventArgs.Keys property to access the values of the key fields (as specified by the FormView.DataKeyNames property) for a deleted record. For example, you can use these values to keep a log of deleted records.
The FormViewDeletedEventArgs.Keys property returns an System.Collections.Specialized.OrderedDictionary object that implements the System.Collections.Specialized.IOrderedDictionary interface. The System.Collections.Specialized.OrderedDictionary object contains DictionaryEntry objects that represent the key fields of the deleted record. To access the field names, use the System.Collections.Specialized.OrderedDictionary.Keys property of the System.Collections.Specialized.OrderedDictionary object. Similarly, you can access the field values by using the System.Collections.Specialized.OrderedDictionary.Values property.
As a shortcut, you can also use the indexer of the System.Collections.Specialized.OrderedDictionary object to access the key field values. The advantage in using the indexer is that it returns key field values directly. Data source controls that rely on the field order (such as System.Web.UI.WebControls.AccessDataSource) can access key field values only by index.