删除Personal Geodatabase中的FeatureClass

try            {                IWorkspaceName pWorkspaceName = new WorkspaceNameClass();                pWorkspaceName.WorkspaceFactoryProgID = "esriDataSourcesGDB.AccessWorkspaceFactory";                pWorkspaceName.PathName = mdbPath + "GIR_DB.mdb";                IName n = pWorkspaceName as IName;                IFeatureWorkspace Workspace = n.Open() as IFeatureWorkspace;                IFeatureClass tmpfeatureclass;                tmpfeatureclass = Workspace.OpenFeatureClass("Tmp_Road_Geocoded");                IDataset set = tmpfeatureclass as IDataset;                set.CanDelete();                set.Delete();            }            catch            {            }