1.	On the view page:
@using ThinkGeo.MapSuite.Core
@using ThinkGeo.MapSuite.MvcEdition
@model ThinkGeo.MapSuite.MvcEdition.Map
@{
    ViewBag.Title = "Default";
}
@{
    Html.ThinkGeo().Map(Model).Render();
}

2.	On the controller page:

        public ActionResult Default()
        {
            Map map = new Map("Map1",
                new System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage),
              new System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage));
            map.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.FromHtml("#E5E3DF"));
            map.CurrentExtent = new RectangleShape(-91.88, 43.17, -69.88, 29.86);
            map.MapUnit = GeographyUnit.DecimalDegree;

            GdiPlusRasterLayer rasterLayer = new GdiPlusRasterLayer(@"world.tif");
            ((GdiPlusRasterSource)(rasterLayer.ImageSource)).StreamLoading += new EventHandler<StreamLoadingEventArgs>(MainForm_StreamLoading);

            LayerOverlay staticOverlay = new LayerOverlay();
            staticOverlay.IsBaseOverlay = false;
            staticOverlay.Layers.Add(rasterLayer);
            map.CustomOverlays.Add(staticOverlay);

            return View(map);
        }

        private void MainForm_StreamLoading(object sender, StreamLoadingEventArgs e)
        {
            if (e.StreamType == "Image File")
            {
                Stream stream = yourImageFileInDataBase.ToStream();
                e.AlternateStream = stream;
            }

            if (e.StreamType == "World File")
            {
                Stream stream = yourWorldFileInDataBase.ToStream();
                e.AlternateStream = stream;
            }
        }