1 public void ChangeBB(string filePath,string fileName) 2         { 3             IMxdContents pMxdC = axMapControl1.Map as IMxdContents; 4             IMapDocument pMapDocument = new MapDocumentClass(); 5             pMapDocument.New(string.Format("{0}/{1}",filePath,fileName)); 6             IDocumentVersion docversion = (IDocumentVersion)pMapDocument; 7             docversion.DocumentVersion = esriArcGISVersion.esriArcGISVersion93; 8             IActiveView pActiveView = axMapControl1.Map as IActiveView; 9             pMapDocument.ReplaceContents(pMxdC);10             pMapDocument.Save(true, true);11         }