//MapControl == WinFormMap Control

      

  private void BuildDetailLayer(DataTable table, mwLegend legend)
        {
           //Setup Detail Layer

            mwMapLayer DetailLayer = new mwMapLayer(table, "name", "location", "",true);
            
            if (DetailLayer.ifFeaturesInitialized)
            {
                DetailLayer.Open();
                DetailLayer.Columns.Add(new FeatureSourceColumn("TotalSelected")); 

                DetailLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

                ClassBreakStyle Breaks = new ClassBreakStyle("TotalSelected");

                for (int j = 0; j < 5; j++)
                {
                    AreaStyle aStyle = new AreaStyle(new GeoPen(GeoColor.StandardColors.Black), new GeoSolidBrush(GeoColor.FromArgb(100, legend.ScaleColors[j])));

                    Breaks.ClassBreaks.Add(new ClassBreak(legend.nScaleValue[j], aStyle));
                }

                DetailLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(Breaks);

                DetailLayer.Close();

                //AreaStyle aStyle = new AreaStyle(new GeoPen(GeoColor.StandardColors.Black), new GeoSolidBrush(GeoColor.FromArgb(100, legend.ScaleColors[3])));
                //DetailLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(aStyle);

                LayerOverlay Layer = new LayerOverlay();
                Layer.Layers.Add("DetailLayer1", DetailLayer);
                MapControl.Overlays.Add("DetailLayer", Layer);

                try
                {
                    DetailLayer.FeatureSource.Open();
ERROR HERE >>>>>>   MapControl.CurrentExtent = DetailLayer.FeatureSource.GetBoundingBox();
                    DetailLayer.FeatureSource.Close();
                }
                catch (SystemException ex)
                {
                    bc.OKMessage(ex.Message);
                }
            }
            
        }


public class mwMapLayer : InMemoryFeatureLayer
    {
        private string IdColumnName;
        private string Longitude;
        private string Latitude;
        private string Polygon;
        private bool ifPolygon = false;
        private DataTable MapTable;
        public bool ifFeaturesInitialized = true;

        public mwMapLayer(DataTable maptable, string idcolumnname, string longitude, string latitude, bool ifpolygon)
        {
            IdColumnName = idcolumnname;
            Longitude = longitude;
            Latitude = latitude;
            ifPolygon = ifpolygon;
            if (ifPolygon)
                Polygon = longitude;

            MapTable = maptable;

            if (!SetupFeatures())
                ifFeaturesInitialized = false;
        }
  
        public bool SetupFeatures()
        {
            try
            {
                Feature feature;

                foreach (DataRow row in MapTable.Rows)
                {
                    if (ifPolygon)
                    {
                        string wkt = row[Polygon].ToString().Trim();

                        if (bc.Left(wkt, 5).Trim() == "MULTI")
                        {
                            MultipolygonShape multi = new MultipolygonShape(wkt);
                            multi.Id = bc.NameProper(row[IdColumnName].ToString(),false);
                            feature = multi.GetFeature();
                        }
                        else
                        {
                            PolygonShape polyShape = new PolygonShape(wkt);
                            polyShape.Id = bc.NameProper(row[IdColumnName].ToString(),false);
                            feature = polyShape.GetFeature();
                        }
                    }
                    else
                    {
                        PointShape pointShape = new PointShape(Convert.ToDouble(row[Longitude]), Convert.ToDouble(row[Latitude]));
                        pointShape.Id = bc.NameProper(row[IdColumnName].ToString(),false);
                        feature = pointShape.GetFeature();
                    }

                    foreach (DataColumn Col in MapTable.Columns)
                    {
                        string Value = row[Col.ColumnName].ToString();
                        feature.ColumnValues.Add(Col.ColumnName, Value);
                    }

                    InternalFeatures.Add(feature);
                    
                }
            }
            catch(SystemException ex)
            {
                bc.OKMessage(ex.Message);
                return false;
            }

            return true;
        }
    }