System.Object
   ESRI.ArcGIS.Mobile.Sketch.FeatureSnappingResult
   ESRI.ArcGIS.Mobile.Sketch.SnappingAgent
   ESRI.ArcGIS.Mobile.Sketch.SnappingEngine
      ESRI.ArcGIS.Mobile.Sketch.SnappingEnvironment
   ESRI.ArcGIS.Mobile.Sketch.SnappingResult
   System.EventArgs
      ESRI.ArcGIS.Mobile.Sketch.SketchEventArgs
   System.MarshalByRefObject
      System.ComponentModel.Component
         ESRI.ArcGIS.Mobile.MapActions.MapAction
            ESRI.ArcGIS.Mobile.Sketch.SketchTool
               ESRI.ArcGIS.Mobile.Sketch.AddVertexSketchTool
               ESRI.ArcGIS.Mobile.Sketch.DeleteVertexSketchTool
               ESRI.ArcGIS.Mobile.Sketch.InsertVertexSketchTool
               ESRI.ArcGIS.Mobile.Sketch.MoveVertexSketchTool
         ESRI.ArcGIS.Mobile.MapGraphicLayer
            ESRI.ArcGIS.Mobile.Sketch.SketchGraphicLayer

Reference

ESRI.ArcGIS.Mobile Assembly