private void DisplayMap_Load(object sender, EventArgs e)
        {
            winformsMap1.MapUnit = GeographyUnit.DecimalDegree;
            winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);

            InMemoryFeatureLayer pointLayers = new InMemoryFeatureLayer(); pointLayers.Open();
            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.City1;
            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = new MyTextStyle("text", new GeoFont("Arial", 10), new GeoSolidBrush(GeoColor.SimpleColors.Black));
            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.OverlappingRule = LabelOverlappingRule.NoOverlapping;
            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.PointPlacement = PointPlacement.UpperRight;
            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.Mask = AreaStyles.Country1;
            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.XOffsetInPixel = 15;

            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.YOffsetInPixel = 15;
            pointLayers.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.MaskMargin = 2;
            pointLayers.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            pointLayers.Columns.Add(new FeatureSourceColumn("text"));

            Feature feature1 = new Feature(0, 0);
            Feature feature2 = new Feature(1, 0);
            feature1.ColumnValues.Add("text", "dfadfefdfefdfefdfe");
            feature2.ColumnValues.Add("text", "222fadfefdfefdfefdfe");

            pointLayers.InternalFeatures.Add(feature1);
            pointLayers.InternalFeatures.Add(feature2);

            LayerOverlay statesOverlay = new LayerOverlay();
            statesOverlay.Layers.Add("MajorCitiesShapes", pointLayers);

            winformsMap1.Overlays.Add("StatesOverlay", statesOverlay);
            winformsMap1.CurrentExtent = new RectangleShape(-20, 20, 20, -20);
            winformsMap1.Refresh();
        }

        class MyTextStyle : TextStyle
        {
            public MyTextStyle(string textColumnName, GeoFont textFont, GeoSolidBrush textSolidBrush)
                : base(textColumnName, textFont, textSolidBrush)
            { }

            protected override void DrawCore(System.Collections.Generic.IEnumerable<Feature> features, GeoCanvas canvas, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInThisLayer, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInAllLayers)
            {
                base.DrawCore(features, canvas, labelsInThisLayer, labelsInAllLayers);
                LineStyle style = new LineStyle(new GeoPen(GeoColor.SimpleColors.Red));

                PointShape upperRightPoint = null;
                int counter = 0;
                foreach (Feature feature in features)
                {
                    upperRightPoint = feature.GetBoundingBox().UpperRightPoint;
                    LineShape line = new LineShape();
                    line.Vertices.Add(new Vertex(upperRightPoint));
                    PointShape lowerRightPoint = ExtentHelper.ToWorldCoordinate(canvas.CurrentWorldExtent, (float)a[counter].ScreenArea.OuterRing.GetBoundingBox().UpperRightPoint.X, (float)a[counter].ScreenArea.OuterRing.GetBoundingBox().UpperRightPoint.Y, canvas.Width, canvas.Height);
                    line.Vertices.Add(new Vertex(lowerRightPoint));

                    style.Draw(new Collection<BaseShape>() { line }, canvas, new Collection<SimpleCandidate>(), new Collection<SimpleCandidate>());
                    counter++;
                }
                a.Clear();
            }
            Collection<LabelingCandidate> a = new Collection<LabelingCandidate>();
            protected override bool CheckOverlappingCore(LabelingCandidate labelingCandidate, GeoCanvas canvas, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInThisLayer, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInAllLayers)
            {
                while (base.CheckOverlappingCore(labelingCandidate, canvas, labelsInThisLayer, labelsInAllLayers))
                {
                    labelingCandidate.CenterPoint.Y -= 2;
                    labelingCandidate.ScreenArea.TranslateByOffset(0, -2);
                }
                a.Add(labelingCandidate);
                return false;
            }
        }