ServerSide:

using System;
using System.Web.Mvc;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.MvcEdition;

namespace CSharp_HowDoISamples
{
    public partial class InteractiveMapController : Controller
    {
        //
        // GET: /AddAClickEvent/

        public ActionResult AddAClickEvent()
        {
            Map map = new Map("Map1",
                    new System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage),
                    510);
            map.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.FromHtml("#E5E3DF"));
            map.CurrentExtent = new RectangleShape(-125, 72, 50, -46);
            map.MapUnit = GeographyUnit.DecimalDegree;

            WorldMapKitWmsWebOverlay worldMapKitOverlay = new WorldMapKitWmsWebOverlay("WorldMapKitOverlay");
            map.CustomOverlays.Add(worldMapKitOverlay);

            InMemoryMarkerOverlay markerOverlay = new InMemoryMarkerOverlay("MarkerOverlay");
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultMarkerStyle.WebImage.ImageWidth = 21;
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultMarkerStyle.WebImage.ImageHeight = 25;
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultMarkerStyle.WebImage.ImageOffsetX = -10.5f;
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultMarkerStyle.WebImage.ImageOffsetY = -25f;
            markerOverlay.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            
            FeatureLayer layer = new ShapeFileFeatureLayer(Server.MapPath("~/App_Data/STATES.SHP"));
            layer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(100, 212, 220, 184), GeoColor.FromArgb(255, 132, 132, 154), 1);
            layer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            LayerOverlay layo = new LayerOverlay("la");
            layo.Layers.Add(layer);
            map.CustomOverlays.Add(layo);

            return View(map);
        }


        [MapActionFilter]
        public void ClickEvent(Map map, GeoCollection<object> args)
        {
            ShapeFileFeatureLayer shpLayer = (map.CustomOverlays["la"] as LayerOverlay).Layers[0] as ShapeFileFeatureLayer;
            var overlay = map.CustomOverlays[1];
            shpLayer.Open();
            shpLayer.FeatureSource.Open();
            for (int i = 0; i < 1000; i++)
            {
                shpLayer.FeatureSource.GetAllFeatures(ReturningColumnsType.AllColumns);
            }
            shpLayer.FeatureSource.Close();
            shpLayer.Close();
        }

        [MapActionFilter]
        public void ClickEvent1(Map map, GeoCollection<object> args)
        {
            ShapeFileFeatureLayer shpLayer = (map.CustomOverlays["la"] as LayerOverlay).Layers[0] as ShapeFileFeatureLayer;
            shpLayer.Open();
            shpLayer.FeatureSource.Open();
            for (int i = 0; i < 1000; i++)
            {
                shpLayer.FeatureSource.GetAllFeatures(ReturningColumnsType.AllColumns);
            }
            shpLayer.FeatureSource.Close();
            shpLayer.Close();
        }
    }
}







ClientSide:

@using ThinkGeo.MapSuite.Core;
@using ThinkGeo.MapSuite.MvcEdition;
@model ThinkGeo.MapSuite.MvcEdition.Map 
<script language="javascript" type="text/javascript">
    function bclick(e) {
        var params = null;
        Map1.ajaxCallAction('@ViewContext.RouteData.Values["Controller"].ToString()', 'ClickEvent1', params, mapCallback1);
    }

    function mapCallback(result) {
        Map1.redrawLayer('MarkerOverlay');
        alert("button1 is finished");
    }

    function b2click(e) {
        var params = null;
        Map1.ajaxCallAction('@ViewContext.RouteData.Values["Controller"].ToString()', 'ClickEvent', params, mapCallback2);
    }
    
    function mapCallback2(result) {
        Map1.redrawLayer('MarkerOverlay');
        alert("button2 is finished");
    }
</script>
<div class="four columns" id="navigation">
    @{Html.RenderPartial("SourceCode");}
    <div id="instrux-body">
        <div id="instrux-text">
            Click on the map to add a marker.
            <input type="button" id="button" onclick="bclick()" value="ClickMe"/>
            <input type="button" id="button2" onclick="b2click()" value="ClickMe"/>
        </div>
    </div>
</div>
<div class="twelve columns" id="main">
    <div>
        @{
            Html.ThinkGeo().Map(Model).Render();
        }
    </div>
</div>