请教C#里MO的问题

<P>我在C#里用下列语句往空白图层里加数据怎么不行：</P>
<P>MapObjects2.Point Pt=new MapObjects2.PointClass();
   MapObjects2.MapLayer Layer=new MapObjects2.MapLayerClass();
   MapObjects2.DataConnection Dc=new MapObjects2.DataConnectionClass();
   string Path="D:\\sc\\demo\\EmptyMap";</P>
<P>   Dc.Database=Path;
   Layer.GeoDataset=Dc.FindGeoDataset("PointLayer");
  
   Point=new MapObjects2.PointClass();
   Point=mapMain.Extent.Center;
  
   Layer.Records.AddNew();
   Layer.Records.Fields.Item("Shape").Value=Point;
   Layer.Records.Update();
   mapMain.Layers.Add(Layer);
   mapMain.Refresh();
   mapMain.CtlRefresh();</P>