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

    ShapeFileFeatureLayer worldShapeLayer = new ShapeFileFeatureLayer(@"..\..\SampleData\Data\Majorcities.shp");
    worldShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.Capital1;
    worldShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = TextStyles.CreateSimpleTextStyle("DynamicPopulation", "Arial", 10, DrawingFontStyles.Regular, GeoColor.StandardColors.Red, 0, -12);
    worldShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.PointPlacement = PointPlacement.UpperLeft;
    worldShapeLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
    worldShapeLayer.FeatureSource.CustomColumnFetch += new EventHandler<CustomColumnFetchEventArgs>(FeatureSource_CustomColumnFetch);

    LayerOverlay staticOverlay = new LayerOverlay();
    staticOverlay.Layers.Add("WorldShapeLayer", worldShapeLayer);
    winformsMap1.Overlays.Add(staticOverlay);

    winformsMap1.CurrentExtent = new RectangleShape(-139.2, 92.4, 120.9, -93.2);
    winformsMap1.Refresh();
}

void FeatureSource_CustomColumnFetch(object sender, CustomColumnFetchEventArgs e)
{
    if (e.ColumnName == "DynamicPopulation"&&e.Id=="20")
    {
        e.ColumnValue = "fillyourname\nfontfileinfor\npointinfor";
    }
}