[mapguide-users] SelectFeatures using SetFilter gives null exception

[Tony]

Hi 
i am using the following code to find the   Pipes that are greater than 12' 
i am getting null exeception 
the sample code in dev guide is the same. why i am getting error
anyone

thanks
tony

MgUserInformation userInfo = new MgUserInformation(mgSessionId);
            MgSiteConnection siteConnection = new MgSiteConnection();
            siteConnection.Open(userInfo);

            MgResourceService resourceService =
siteConnection.CreateService(MgServiceType.ResourceService) as
MgResourceService;
            MgFeatureService featureService =
siteConnection.CreateService(MgServiceType.FeatureService) as
MgFeatureService;
            
            MgFeatureQueryOptions districtQuery = new
MgFeatureQueryOptions();
            districtQuery.SetFilter("Size > 12");
            
            MgMap map = new MgMap();
            map.Open(resourceService, "General Public Map");
            MgLayer layer = map.GetLayers().GetItem("SD") as MgLayer;
           
            MgFeatureReader featureReader =
layer.SelectFeatures(districtQuery);
//getting error here 
            featureReader.ReadNext();
            
            MgByteReader districtGeometryData =
featureReader.GetGeometry("Geometry");
            MgAgfReaderWriter agfReaderWriter = new MgAgfReaderWriter();
            MgGeometry districtGeometry =
agfReaderWriter.Read(districtGeometryData);
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