backup2

 /// <summary>
 /// 先在窗体上添加LicenceControl控件
 /// Enable 3D analysis
 /// </summary>
 public void Enable3DAnalysis()
 {
     ESRI.ArcGIS.esriSystem.IExtensionManagerAdmin iExtensionManagerAdmin = new ESRI.ArcGIS.esriSystem.ExtensionManagerClass();
     UID iUid3D = new UIDClass();
     iUid3D.Value = "{94305472-592E-11D4-80EE-00C04FA0ADF8}";
     object o = new object();
     iExtensionManagerAdmin.AddExtension(iUid3D, ref o);
     IExtensionConfig iExtensionConfig = (IExtensionConfig)(iExtensionManagerAdmin as IExtensionManager).FindExtension(iUid3D);
     iExtensionConfig.State = esriExtensionState.esriESEnabled;
 }

arcgis engine extension