why sometime ajax success function doesn't work in asp.net mvc?

Question

In my project, I've used datatable for crud operation.but I have a problem sometimes didn't work success function, of course, I saw my network tab I received { status":true} but datatable didn't reload and I redirected to the blank page.I've added alert function into success function but my alert function didn't work.sometimes I got this error The required anti-forgery form field "__RequestVerificationToken" is not present. when I want to delete a record from a table. and also sometimes create and edit give me { status":true} message.

// GET: Admin/Users/Delete/5
public ActionResult Delete(string id)
{
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }
    User user = db.User.Find(id);
    UserViewModel userViewModel=new UserViewModel();
    userViewModel.UserId = user.Id;
    userViewModel.UserName = user.UserName;
    userViewModel.FirstName = user.FirstName;
    userViewModel.LastName = user.LastName;
    userViewModel.Email = user.Email;
    userViewModel.IsActive = user.IsActive;
    userViewModel.Gender = user.Gender;
    userViewModel.PhoneNumber = user.PhoneNumber;
    userViewModel.Address = user.Address;
    if (user == null)
    {
        return HttpNotFound();
    }
    return PartialView(userViewModel);
}

// POST: Admin/Users/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(string id)
{
    bool status=false;
    User user = db.User.Find(id);
    db.User.Remove(user);
    db.SaveChanges();

    return Json(new { status = true }, JsonRequestBehavior.AllowGet);
}

==========================

@model  IEnumerable


@{
    ViewBag.Title = "مدیریت کاربران";

}

@*مدیریت کاربران*@

@section Styles{

    
    
    
    
}





    
    
        
            
                کاربران
            
            
                
                     کاربر جدید
                
                
                     چاپ
                
            
        
        
            
                        @**@
                        
                
                    
                                
                                    
                                    
                                
                            نام کاربری 
                        نام 
                        نام خانوادگی
                        جنسیت
                        ایمیل
                        وضعیت
                        شماره تماس
                        آدرس
                        ویرایش
                        حذف
                    
                


            
        
    





    
        
        ویرایش کاربران
    
    
        

        
    




    
        
        آیا قصد حذف این کاربر را دارید؟
    
    
        

        
    




    
        
           کاربر جدید 
    
    


    









@section scripts{


    
    
    
    

    
    
    
    

    
    

    
}

===================================

  @model Dentistry.Areas.ViewModels.UserViewModel

@*حذف

    آیا شما قصد حذف این سطر را دارید؟*@
@*
        
        آیا شما قصد حذف این سطر را دارید؟
    *@

@using (Html.BeginForm("Delete", "Users", FormMethod.Post, new { @class = "popupForm" }))
{
    @Html.AntiForgeryToken()
    if (Model != null && Model.UserId != string.Empty)
    {
        @Html.HiddenFor(a => a.UserId, new { id = "userId" })
        
            
                نام کاربری : 
                @Html.DisplayFor(model => model.UserName)
            
            
                نام : 
                @Html.DisplayFor(model => model.FirstName)
            
            
                نام خانوادگی : 
                @Html.DisplayFor(model => model.LastName)
            
            
                شماره همراه : 
                @Html.DisplayFor(model => model.PhoneNumber)
            
        
        
            
                جنسیت
                @Html.DisplayFor(model => model.Gender)
            
            
                وضعیت : 
                @Html.DisplayFor(model => model.IsActive)
            
            
                ایمیل : 
                @Html.DisplayFor(model => model.Email)
            
            
                آدرس : 
                @Html.DisplayFor(model => model.Address)
            
        
        
            
                
                
            
        
    }
}

why sometime ajax success function doesn't work in asp.net mvc?

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