This property is used when the ConflictOption property is set to OverwriteChanges, otherwise all columns will be used in the WHERE clause.
If KeyFields is nonempty, its value is used as list of columns for the WHERE clause. If KeyFields is empty, the primary key columns are used.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2