The FormView.ModeChanging event is raised when a System.Web.UI.WebControls.FormView control attempts to switch between edit, insert, and read-only mode, but before the mode actually changes. Use the FormViewModeEventArgs.CancelingEdit property to determine whether the FormView.ModeChanging event was raised as a result of the user canceling an edit or insert operation. For example, you might want to reset the System.Web.UI.WebControls.FormView control whenever the user cancels an edit operation.