ArcEngine 3D extension has not been enabled .

        /// <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;
        }