加载mdb文件

private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();
            dlg.Title = "打开文件";
            dlg.Filter = "(*.mdb)|*.mdb|All Files(*.*)|*.* ";
            dlg.ShowDialog();
            string path = dlg.FileName;


            IWorkspaceFactory pAccessWorkspaceFactory;
            IFeatureWorkspace pFeatureWorkspace;
            IFeatureLayer pFeatureLayer;
            IFeatureDataset pFeatureDataset;
            pAccessWorkspaceFactory = new AccessWorkspaceFactoryClass();


            IWorkspace pWorkspace = pAccessWorkspaceFactory.OpenFromFile(path, 0);
            IEnumDataset pEnumDataset = pWorkspace.get_Datasets(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTAny);
            pEnumDataset.Reset();
            IDataset pDataset = pEnumDataset.Next();


            if (pDataset is IFeatureDataset)
            {
                pFeatureWorkspace = (IFeatureWorkspace)pAccessWorkspaceFactory.OpenFromFile(path, 0);
                pFeatureDataset = pFeatureWorkspace.OpenFeatureDataset(pDataset.Name);
                IEnumDataset pEnumDataset1 = pFeatureDataset.Subsets;
                pEnumDataset1.Reset();
                IDataset pDataset1 = pEnumDataset1.Next();


                if (pDataset1 is IFeatureClass)
                {
                    pFeatureLayer = new FeatureLayerClass();
                    pFeatureLayer.FeatureClass = pFeatureWorkspace.OpenFeatureClass(pDataset1.Name);
                    pFeatureLayer.Name = pFeatureLayer.FeatureClass.AliasName;
                    axMapControl1.Map.AddLayer(pFeatureLayer);
                    axMapControl1.ActiveView.Refresh();
                }
            }
            else
            {
                pFeatureWorkspace = (IFeatureWorkspace)pWorkspace;
                pFeatureLayer = new FeatureLayerClass();
                pFeatureLayer.FeatureClass = pFeatureWorkspace.OpenFeatureClass(pDataset.Name);
                pFeatureLayer.Name = pFeatureLayer.FeatureClass.AliasName;
                axMapControl1.Map.AddLayer(pFeatureLayer);
                axMapControl1.ActiveView.Refresh();
            }
        }