vb6和vb.net的区别?

<LI class=msgarticle>这是vb.net的代码，在vb6中可以执行在.net中为何不执行？谁帮帮我？谢谢<BR>dim pMap as map<BR>dim pLayer as Ilayer<BR>dim pOther as Object<BR>dim pItem as esriTOCControlItem<BR>dim pIndex as object<BR>pItem=esriTOCControlItem.esriTOCControlItemLayer<BR>AxTOCControl.HitTest(e.x,e.y,pItem,pMap,pLayer,pOther,pIndex)<BR>microsoft.visualbasic.msgbox(pLayer.Name)'这句没执行<BR></LI><img src="images/post/smile/dvbbs/em12.gif" /><img src="images/post/smile/dvbbs/em12.gif" />

没有人知道吗？还是不肯赐教？<img src="images/post/smile/dvbbs/em15.gif" /><img src="images/post/smile/dvbbs/em15.gif" /><img src="images/post/smile/dvbbs/em15.gif" /><img src="images/post/smile/dvbbs/em15.gif" /><img src="images/post/smile/dvbbs/em15.gif" />