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

            string connectString = yourconnectionstring;
            myfeatuerlayer sql2008Layer = new myfeatuerlayer();

            sql2008Layer.ConnectionString = connectString;
            sql2008Layer.TableName = TableName;
            sql2008Layer.FeatureIdColumn = FeatureIdColumn;

            UnmanagedProj4Projection prj = new UnmanagedProj4Projection();
            prj.InternalProjectionParametersString = UnmanagedProj4Projection.GetEpsgParametersString(3395);
            prj.ExternalProjectionParametersString = UnmanagedProj4Projection.GetGoogleMapParametersString();
            prj.Open();

            sql2008Layer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Country1;
            sql2008Layer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            rotateProjection = new RotationProjection();
            sql2008Layer.FeatureSource.Projection = prj;
            (sql2008Layer.FeatureSource as MyFeatureSource).rotateProjection = rotateProjection;
            sql2008Layer.Open();
            rotateProjection.Open();

            LayerOverlay worldOverlay = new LayerOverlay();
            worldOverlay.Drawn += new EventHandler<DrawnOverlayEventArgs>(worldOverlay_Drawn);
            worldOverlay.Layers.Add("WorldLayer", sql2008Layer);
            winformsMap1.Overlays.Add("WorldOverlay", worldOverlay);

            winformsMap1.ZoomLevelSnapping = ZoomLevelSnappingMode.None;
            winformsMap1.CurrentExtent = rotateProjection.GetUpdatedExtent(sql2008Layer.GetBoundingBox());

            winformsMap1.Refresh();
        }

        void worldOverlay_Drawn(object sender, DrawnOverlayEventArgs e)
        {
                   UnmanagedProj4Projection prj = new UnmanagedProj4Projection();
                   prj.InternalProjectionParametersString = UnmanagedProj4Projection.GetEpsgParametersString(3395);
            prj.ExternalProjectionParametersString = UnmanagedProj4Projection.GetGoogleMapParametersString();
            prj.Open();

            ((sender as LayerOverlay).Layers[0] as MsSql2008FeatureLayer).FeatureSource.Projection = prj;
        }

        class myfeatuerlayer : MsSql2008FeatureLayer
        {
            public myfeatuerlayer()
            { 
            FeatureSource= new MyFeatureSource();
            }
        }

        class MyFeatureSource : MsSql2008FeatureSource
        {
            public RotationProjection rotateProjection;
            protected override Collection<Feature> GetFeaturesForDrawingCore(RectangleShape boundingBox, double screenWidth, double screenHeight, System.Collections.Generic.IEnumerable<string> returningColumnNames)
            {
                Collection<Feature> features = base.GetFeaturesForDrawingCore(boundingBox, screenWidth, screenHeight, returningColumnNames);
                 Collection<Feature> convertedFeatures=new Collection<Feature>();

                UnmanagedProj4Projection prj = new UnmanagedProj4Projection();
                prj.InternalProjectionParametersString = UnmanagedProj4Projection.GetEpsgParametersString(3395);
                prj.ExternalProjectionParametersString = UnmanagedProj4Projection.GetGoogleMapParametersString();
                prj.Open();

                foreach (Feature feature in features)
                {
                    convertedFeatures.Add(prj.ConvertToExternalProjection(feature));
                }

                this.Projection = rotateProjection;
                return convertedFeatures;
            }
        }


        private void btnRotateCounterclockwise_Click(object sender, EventArgs e)
        {
            rotateProjection.Angle += 20;
            winformsMap1.CurrentExtent = rotateProjection.GetUpdatedExtent(winformsMap1.CurrentExtent);

            winformsMap1.Refresh(winformsMap1.Overlays["WorldOverlay"]);
        }

        private void btnRotateClockwise_Click(object sender, EventArgs e)
        {
            rotateProjection.Angle -= 20;
            winformsMap1.CurrentExtent = rotateProjection.GetUpdatedExtent(winformsMap1.CurrentExtent);

            winformsMap1.Refresh(winformsMap1.Overlays["WorldOverlay"]);
        }