[mapguide-users] Combining features

[A H]

this should be easy, but i'm still having trouble figuring out.

i have a system that allow user to draw multiple polygons, and save the
polygon into a spatial database.

i have this code

		MgFeatureQueryOptions queryStr = new MgFeatureQueryOptions();
		queryStr.SetFilter("ID > 0");
		MgFeatureReader featureReader = polyLayer.SelectFeatures(queryStr);
		
		featureReader.ReadNext();
		MgByteReader geom = featureReader.GetGeometry("GEOM");

		MgPropertyCollection properties = new MgPropertyCollection();
		
		properties.Add(new MgInt64Property("AREA_ID", areaID));
		properties.Add(new MgStringProperty("AREA_NAME", areaName));
		properties.Add(new MgGeometryProperty(GEOM_PROPERTY, geom));


but this will only get geometry of 1 of the polygons.
can someone help me to modify this so that it save all the polygons into 1
new area that consist of the polygons in 'geom'?

i'm thinking of something like:

   while(featureReader.ReadNext())
   {
       // store the results into 1 geometry
       // read into MgByteReader
   }


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