GeoLine geoline = geoLineM.ConvertToLine();
BufferAnalystParameter bufferParameter = new BufferAnalystParameter();
bufferParameter.LeftDistance = 20;
GeoRegion georegion = SuperMap.Analyst.SpatialAnalyst.BufferAnalystGeometry.CreateBuffer(geoline, bufferParameter);
m_trackingLayer.Add(georegion, "georegion");
m_mapControl.Map.RefreshTrackingLayer();