升级ArcEngine How to migrate ArcGIS 9.3 Desktop and Engine stand-alone applications to ArcGIS 10

参考资料：http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#//0001000002ns000000

问题起因：如参考资料的标题migrate ArcGIS 9.3 Desktop and Engine stand-alone applications to ArcGIS 10

问题1：Type 'BaseCommand' is not defined.
解决：未完待续