Public Overloads Sub SearchAsync( _
   ByVal inputGeometry As Geometry, _
   ByVal resultCallback As Action(Of IList(Of S57FeatureObject)) _
) 

public void SearchAsync( 
   Geometry inputGeometry,
   Action<IList<S57FeatureObject>> resultCallback
)

The SearchAsync operation takes a spatial geometry object (typically a MapPoint, Polyline, Polygon or Envelope) and returns a collection of S57FeatureObjects which intersect that geometry and/or the provided. Consider alternatively using the overloaded SearchAsync methods which take a buffer distance as a Double, and a S57 object name (acronym) as a String. To perform a search in screen coordinates you should use the HitTestAsync(Point,Int32,Action<IList<S57FeatureObject>>,Int32) or HitTestAsync(Rect,Int32,Action<IList<S57FeatureObject>>) methods.