I Have a webpart page, which has layout as shown in picture,

Now I want to add a webpart to second "Top" zone of my page but I dont know how to access it, If I want to add it to first top zone I use this code,
WPMgr = web.GetLimitedWebPartManager("default.aspx", PersonalizationScope.Shared);
WebPart CmsWP = new WebPart();
this.WPMgr.AddWebPart(CmsWP, "Top", 0);
Cheers
