protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    => optionsBuilder
        .UseLazyLoadingProxies()
        .UseSqlServer(myConnectionString);

    .AddDbContext<BloggingContext>(
        b => b.UseLazyLoadingProxies()
              .UseSqlServer(myConnectionString));

public class Blog
{
    public int Id { get; set; }
    public string Name { get; set; }
    public virtual ICollection<Post> Posts { get; set; }
}
public class Post
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }
    public virtual Blog Blog { get; set; }
}

public class Blog
{
    private ICollection<Post> _posts;
public Blog()
    {
    }
private Blog(ILazyLoader lazyLoader)
    {
        LazyLoader = lazyLoader;
    }
private ILazyLoader LazyLoader { get; set; }
public int Id { get; set; }
    public string Name { get; set; }
public ICollection<Post> Posts
    {
        get => LazyLoader?.Load(this, ref _posts);
        set => _posts = value;
    }
}
public class Post
{
    private Blog _blog;
public Post()
    {
    }
private Post(ILazyLoader lazyLoader)
    {
        LazyLoader = lazyLoader;
    }
private ILazyLoader LazyLoader { get; set; }
public int Id { get; set; }
    public string Title { get; set; }
    public string Content { get; set; }
public Blog Blog
    {
        get => LazyLoader?.Load(this, ref _blog);
        set => _blog = value;
    }
}

[DisplayName("تاریخ شروع قرارداد")]
[Required(ErrorMessage = "تاریخ شروع قرارداد مشخص نشده است")]
public DateTime ContractStartDate { get; set; }

 @Html.EditorFor(model => model.ContractStartDate, MVC.Shared.Views.EditorTemplates.PersianDatePicker)

[HttpPost]
        [ValidateAntiForgeryToken()]
        public virtual ActionResult Create(AddContractVM vm)
        {
            if (!ModelState.IsValid)
            {
                return View(vm);
            }
            else
            {
                if (new Services.Contract().Add(vm))
                {
                    return RedirectToAction("Index");
                }
                else
                {
                    return View(vm);
                }
            }
        }

  public virtual async Task<ActionResult> Login(LoginViewModel viewModel, string returnUrl)
  {

       // ... more code
        var user =  await this._userManager.FindByNameAsync(viewModel.UserName);
        await this._userManager.GenerateUserIdentityAsync(user);

            return this.View(viewModel);
  }

public class SupplierViewModel
{  
   public string name { get; set; }   
   public AddressViewModel AddressViewModel { get; set; }=new AddressViewModel();    }

public class AddressViewModel
{
   public string phone_mobile { get; set; }
   public string address1 { get; set; }
}

public class Supplier 
{      
   public int Id { get; set; }   
   public string name { get; set; } 
   public virtual Address Address { get; set; } 
} 

CreateMap<Supplier, SupplierViewModel>().IgnoreAllUnmapped()  });
CreateMap<Address, AddressViewModel>()
var viewModel =
         await  _suppliers.AsNoTracking()
                   .ProjectTo<SupplierViewModel>(parameters:null,configuration: _mappingEngine.ConfigurationProvider)
                   .FirstOrDefaultAsync(a => a.Id == id);

 public virtual ActionResult Sitemap()
        {
            var data = new sunn.Models.ApplicationDbContext().Posts.ToList();
            SiteMap sm = new SiteMap();
            foreach (var siteno in data)
            {
                sm.Add(new Location()
                   {
                       Url = string.Format("http://www.MySite.ir/Develop/Home/Post/{0}", siteno.Id),
                       LastModified = siteno.InsertDate,
                       Priority = 0.5D
                   });
            }

            return new XmlResult(sm);
        }

        public async Task<IList<NewsSliderModel>> GetNewsSliderTable(CancellationToken cancellationToken = default(CancellationToken))
        {
            IQueryable<News> selectednews = _news.Take(_sliderTakeCount).AsQueryable();
             ...
             ...
            return await selectednews.Select(x => new NewsSliderModel
            {
                NewsId = x.Id,
                Title = x.Title,
                ImagePath = x.ImagePath,
                ImageTitle = x.ImageTitle,
                ImageDescription = x.ImageDescription,
            }).ToListAsync();

        }

        public virtual async Task<ActionResult> MainSlider()
        {
            IList<NewsSliderModel> SliderList = await _newsService.GetNewsSliderTable(Order.Descending, NewsOrderBy.Id);
            return PartialView(MVC.Home.Views._MainSlider, SliderList.ToList());
        }

HttpServerUtility.Execute blocked while waiting for an asynchronous operation to complete.

var context = new NorthwindDataContext();
context.tblCities.MergeOption = MergeOption.NoTracking;

public virtual IInternalQuery<TElement> AsNoTracking()
{
   return (IInternalQuery<TElement>) new InternalQuery<TElement>(this._internalContext, (ObjectQuery)    DbHelpers.CreateNoTrackingQuery((ObjectQuery) this._objectQuery));
}

public static IQueryable CreateNoTrackingQuery(ObjectQuery query)
{
  IQueryable queryable = (IQueryable) query;
  ObjectQuery objectQuery = (ObjectQuery) queryable.Provider.CreateQuery(queryable.Expression);
  objectQuery.MergeOption = MergeOption.NoTracking; // اینجا کار خاموش سازی ردیابی انجام شده
  return (IQueryable) objectQuery;
}