private void hydrographyLayer_DrawingFeatures(object sender, DrawingFeaturesEventArgs e)
 {
     if (!IsHydrographyLayerVisiable())
     {
         e.Cancel = true;
     }
 }
        private void worldLayer_DrawingFeatures(object sender, DrawingFeaturesEventArgs e)
        {
            Collection<Feature> featuresToDrawn = new Collection<Feature>();
            foreach (Feature feature in e.FeaturesToDraw)
            {
                double population = Convert.ToDouble(feature.ColumnValues["POP_CNTRY"], CultureInfo.InvariantCulture);
                if (population > 10000000)
                {
                    featuresToDrawn.Add(feature);
                }
            }

            e.FeaturesToDraw.Clear();
            foreach (Feature feature in featuresToDrawn)
            {
                e.FeaturesToDraw.Add(feature);
            }
        }
        private void worldLayer_DrawingFeatures(object sender, DrawingFeaturesEventArgs e)
        {
            Collection <Feature> featuresToDrawn = new Collection <Feature>();

            foreach (Feature feature in e.FeaturesToDraw)
            {
                double population = Convert.ToDouble(feature.ColumnValues["POP_CNTRY"], CultureInfo.InvariantCulture);
                if (population > 10000000)
                {
                    featuresToDrawn.Add(feature);
                }
            }

            e.FeaturesToDraw.Clear();
            foreach (Feature feature in featuresToDrawn)
            {
                e.FeaturesToDraw.Add(feature);
            }
        }