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copied!<p>I dont see this behaviour here. Can you try my sample?</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using NLog; using System.Globalization; using System.Threading; namespace Mvc4Application.Controllers { public class GeoCodingTask { public string Photoid{get;set;} } public class User { public List<GeoCodingTask> PhotoGeocodingTasks {get;set;} } public class HomeController : Controller { private static Logger _logger = LogManager.GetCurrentClassLogger(); public ActionResult SetupCoordinatesTask() { User user = new User{ PhotoGeocodingTasks = new List<GeoCodingTask>()}; user.PhotoGeocodingTasks.Add(new GeoCodingTask{ Photoid= "id1"}); user.PhotoGeocodingTasks.Add(new GeoCodingTask { Photoid = "id2" }); Session["User"] = user ; return View("GetCoordinatesTask"); } public ActionResult GetCoordinatesTask() { User user = (User)Session["User"]; if (user == null) { _logger.Error("No user in session!"); return View(); } if (user.PhotoGeocodingTasks == null ) _logger.Debug("PhotoGeocodingTasks - null " ); if (user.PhotoGeocodingTasks.Count == 0) { _logger.Debug("Pre-processing - PhotoGeocodingTasks.Count" + user.PhotoGeocodingTasks.Count); return View(); } lock (user.PhotoGeocodingTasks) { _logger.Debug("Pre-processing - PhotoGeocodingTasks.Count" + user.PhotoGeocodingTasks.Count); var task = user.PhotoGeocodingTasks[0]; if (!user.PhotoGeocodingTasks.Remove(task)) _logger.Error("Could not remove geocoding task after picking it up!"); _logger.Debug("Post processing - SessionID: " + Session.SessionID); _logger.Debug("Post processing - PhotoGeocodingTasks.Count" + user.PhotoGeocodingTasks.Count); return View(); } } } } </code></pre> <p>I first call <a href="http://localhost:1631/home/SetupCoordinatesTask" rel="nofollow">http://localhost:1631/home/SetupCoordinatesTask</a> to setup the session and then on 2 times <a href="http://localhost:1631/home/GetCoordinatesTask" rel="nofollow">http://localhost:1631/home/GetCoordinatesTask</a> </p> <p>The result is</p> <pre><code>thread:19|2012-01-20 22:12:51.0492|DEBUG|Mvc4Application.Controllers.HomeController|Pre-processing - PhotoGeocodingTasks.Count2 thread:19|2012-01-20 22:12:51.0652|DEBUG|Mvc4Application.Controllers.HomeController|Post processing - SessionID: e4tawytx2mfq2msc3y2ajzl3 thread:19|2012-01-20 22:12:51.0652|DEBUG|Mvc4Application.Controllers.HomeController|Post processing - PhotoGeocodingTasks.Count1 thread:10|2012-01-20 22:13:01.0928|DEBUG|Mvc4Application.Controllers.HomeController|Pre-processing - PhotoGeocodingTasks.Count1 thread:10|2012-01-20 22:13:01.0928|DEBUG|Mvc4Application.Controllers.HomeController|Post processing - SessionID: e4tawytx2mfq2msc3y2ajzl3 thread:10|2012-01-20 22:13:01.0928|DEBUG|Mvc4Application.Controllers.HomeController|Post processing - PhotoGeocodingTasks.Count0 thread:15|2012-01-20 22:13:02.6698|DEBUG|Mvc4Application.Controllers.HomeController|Pre-processing - PhotoGeocodingTasks.Count0 </code></pre> <p>Can you simplify tyour code and post a complete sample?</p>

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