The IFeatureWorkspace has the methods like that: OpenFeatureClass(), OpenTable(), ... The ESRI.ArcGIS.Location.IDatabaseLocatorWorkspace does not have this kind of methods. In order to open a LocatorClass in the ESRI.ArcGIS.Location.IDatabaseLocatorWorkspace, how can it be done? I wish ESRI's Linear Reference group or some ArcObjects professionals can help me for this issue. Thanks.