No More than 2 Apps Should be Submitted on Single Date(Logic help)

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C#

C#4.0

i need help with logic where a form contains parameters such App Icon,App Title,App desription,Offer Starting Date and Offer Ending date..

The Condition when i click submit button is suppose There 2 apps present on Same Date it should ask user to Select another date.. but my logic doesnt work properly.. i am able to submit even 3 apps in Same Date

public ActionResult SubmitApp(FormCollection fc)
{

    try
    {
        if (Session["userid"] != null)
        {

            if (string.IsNullOrEmpty(fc["actualprice"]) || string.IsNullOrEmpty(fc["offerprice"]) || string.IsNullOrEmpty(fc["datepickerstart"]) || string.IsNullOrEmpty(fc["datepickerend"]) || string.IsNullOrEmpty(fc["link"]) || string.IsNullOrEmpty(fc["title"]))
            {
                ViewBag.Success = "Please fill all the fields"; return View();
            }
            else
            {

                if (ModelState.IsValid)
                {

                    Submit_App sa = new Submit_App();
                    sa.App_type = fc["Fapp"];
                    sa.Actual_Price = Decimal.Parse(fc["actualprice"]);
                    sa.offerprice = Decimal.Parse(fc["offerprice"]);
                    sa.App_Description = fc["description"];
                    sa.App_Title = fc["title"];
                    if (fc["link"].StartsWith("https://")) { sa.iTunes_Link = fc["link"]; }
                    else
                    {
                        sa.iTunes_Link = "https://" + fc["link"];
                    }
                    sa.UserID = (long)Session["userid"];
                    sa.StartDate = DateTime.ParseExact(@fc["datepickerstart"], "dd-MM-yyyy HH:mm", CultureInfo.InvariantCulture);
                    sa.EndDate = DateTime.ParseExact(@fc["datepickerend"], "dd-MM-yyyy HH:mm", CultureInfo.InvariantCulture);
                    sa.downloads_count = 0;

                    if (sa.StartDate > sa.EndDate)
                    {
                        ViewBag.success = "End Date should be higher than Start Date";
                        return View();
                    }
                    var id = Session["userid"];

                    var stdate = DateTime.ParseExact((@fc["datepickerstart"]), "dd-MM-yyyy HH:mm", CultureInfo.InvariantCulture);
                    var enddate = DateTime.ParseExact((@fc["datepickerend"]), "dd-MM-yyyy HH:mm", CultureInfo.InvariantCulture);
                    var contents = from u in entity.Submit_App
                                   where ((u.StartDate == stdate && u.EndDate == enddate) || (u.StartDate <= stdate && u.EndDate >= enddate) || (u.StartDate >= stdate && u.EndDate <= enddate)) //&& u.UserID == (long)id
                                   select new { u.EndDate, u.StartDate };

                    int count = 0; //s = contents.Count();
                    foreach (var item in contents)
                    {
                        //if ((item.StartDate == stdate && item.EndDate == enddate) || (item.StartDate <= stdate && item.EndDate >= enddate) || (item.StartDate >= stdate && item.EndDate <= enddate))
                        //{
                        count++; //}
                    }
                    if (count < 2)
                    {
                        string icons=save(Request.Files["icon"], "~/icons");
                        string images=save(Request.Files["img"], "~/images");
                        if ((images==null || images=="") || (icons==null || icons==""))
                        {
                            ViewBag.success = "Please Upload App Icon/Image";
                            return View();
                        }
                        else
                        {
                            sa.App_Icon = "/icons/" + icons;
                            sa.App_Image = "/images/" + images;

                            entity.AddToSubmit_App(sa);
                            entity.SaveChanges();
                            Login_Table app = entity.Login_Table.ToList().Where(x => x.UserID == (long)Session["userid"]).First();
                            app.Apps_Published = app.Apps_Published + 1;
                            entity.SaveChanges();
                            ViewBag.success = "App published succesfully";
                            return View();
                        }
                    }
                    else
                    {
                        ViewBag.success = "2 Apps registered on your selected date choose another date";
                        return View();
                    }

                }
            }
        }
        else { return RedirectToAction("Login", "Login"); }
        return View();
    }
    catch(Exception ex)
    {
        ViewBag.success = ex.Message.ToString();
        return View();
    }
    //}

}