C#与MO如何调用shape图层？

<TABLE  width="90%" border=0>

<TR>
<TD  width="100%">

<P><FONT size=5>请问有谁知道：地理信息系统二次开发实例教程-C#和MapObjects实现 这本书中的图层的加入与控制，我怎么调用shape图层不起作用啊？程序运行的结果是窗口上什么图都没有啊，怎么会这样啊？是shape图有问题还是源代码有问题？有谁能帮帮我？感激不尽！谢谢！</FONT></P></TD></TR></TABLE>

<P>//===============加入地图图层==================//<BR>   ESRI.MapObjects2.Core.DataConnection moCon = new ESRI.MapObjects2.Core.DataConnection();<BR>   ESRI.MapObjects2.Core.MapLayer moLay0 = new ESRI.MapObjects2.Core.MapLayer();<BR>   ESRI.MapObjects2.Core.MapLayer moLay1 = new ESRI.MapObjects2.Core.MapLayer();<BR>   ESRI.MapObjects2.Core.MapLayer moLay2 = new ESRI.MapObjects2.Core.MapLayer();</P>
<P>   string shpPath = Application.StartupPath + "<a>\\Data\\</A>";<BR>   moCon.Database = shpPath;</P>
<P>   moLay0.GeoDataset = moCon.FindGeoDataset("云南州界");<BR>   this.axMap1.Layers.Add(moLay0);</P>
<P>   moLay1.GeoDataset = moCon.FindGeoDataset("云南道路");<BR>   this.axMap1.Layers.Add(moLay1);</P>
<P>   moLay2.GeoDataset = moCon.FindGeoDataset("云南城市");<BR>   this.axMap1.Layers.Add(moLay2);</P>