Assembly: System.Web (in System.Web.dll)
The method is a critical method on a LayoutEditorPart control. It implements the SyncChanges method from the base class, retrieves the current values from the associated WebPart control, and updates the child controls in the LayoutEditorPart control with those values so a user can edit them.
The method is called whenever the values in the associated WebPart control might have changed. For a LayoutEditorPart control, the EditorZoneBase zone that contains the control calls the method immediately after calling the ApplyChanges method, so that the values in the LayoutEditorPart control are always synchronized with the values in the associated WebPart control. Another case where the method is called is when a WebPart control is initially entering edit mode.Notes to Callers
Although you can call the method from your code, it is not necessary to do so. The Web Parts control set calls this method and the ApplyChanges method at the proper times in the editing process to keep editing controls synchronized with their associated WebPart controls.