连接SDE是正常，但地图上就是不显示那图层?解决方法

连接SDE是正常，但地图上就是不显示那图层?

是9.3版的

//License
  IAoInitialize pAoInit = new AoInitializeClass();
  pAoInit.Initialize(esriLicenseProductCode.esriLicenseProductCodeArcEditor);


  //Workspace
  IWorkspaceFactory pWorkspaceFactory;
  pWorkspaceFactory = new SdeWorkspaceFactoryClass();

  //PropertySet
  IPropertySet pPropertySet;
  pPropertySet = new PropertySetClass();


  //pPropertySet.SetProperty("Service", "mapdataserver");


  //设置数据库服务器名 
  pPropertySet.SetProperty("SERVER", "mapdataserver"); //\\sqlexpress


  //设置SDE的端口，这是安装时指定的，默认安装时port:
  pPropertySet.SetProperty("INSTANCE", "5151");


  //SDE的用户名 
  pPropertySet.SetProperty("USER", "sa");


  //密码
  pPropertySet.SetProperty("PASSWORD", "123456");


  //设置数据库的名字 sde_sz1 szSDE 
  pPropertySet.SetProperty("DATABASE", "GZmap");


  //SDE的版本,在这为默认版本
  pPropertySet.SetProperty("VERSION", "dbo.DEFAULT");

  //IFeatureWorkspace对象
  IFeatureWorkspace pSdeWorkspace;
  IFeatureDataset pFeatureDataset;
  IFeatureClass pFeatureClass;

  //图层
  ESRI.ArcGIS.Carto.IFeatureLayer layer;

  //连接
  pSdeWorkspace = (IFeatureWorkspace)pWorkspaceFactory.Open(pPropertySet, 0);


  //取数据
  //pFeatureDataset = pSdeWorkspace.OpenFeatureDataset("szmap.DBO.公司企业");
  pFeatureClass = pSdeWorkspace.OpenFeatureClass("szmap.DBO.铁路"); //行政区域 铁路


  //定义图层
  layer = new FeatureLayerClass();

  //设定layer的FeatureClass属性
  layer.FeatureClass = pFeatureClass;
  layer.Name = pFeatureClass.AliasName;

  ESRI.ArcGIS.ADF.Web.UI.WebControls.MapResourceItem t = new ESRI.ArcGIS.ADF.Web.UI.WebControls.MapResourceItem();
  t.Data = pFeatureClass;

  //MapResourceManager1.ResourceItems.Clear();

  int n = MapResourceManager1.ResourceItems.Count;
  MapResourceManager1.ResourceItems.Insert(n, t);

  MapResourceManager1.ResourceItems.Add(t);
  MapResourceManager1.CreateResource(t);
   
   

  Map1.InitializeFunctionalities();

  if (Map1.ImageBlendingMode == ImageBlendingMode.WebTier)
  {
  Map1.Refresh();
  }
  else
  {
  Map1.RefreshResource("MapResourceManager1");
  }

  Response.Write(MapResourceManager1.ResourceItems.Count.ToString());
  Map1.Refresh();





前台

  <form id="form1" runat="server">
  <div>
   

  <esri:MapResourceManager ID="MapResourceManager1" runat="server">
  </esri:MapResourceManager>
   
  <esri:Map ID="Map1" runat="server" Height="200px" Width="300px"
  MapResourceManager="MapResourceManager1" BorderStyle="Solid" 
  BorderColor="Green" PrimaryMapResource="MapResourceItem0"