Update record ASP.NET MVC - asp.net

Question

I have a few problems and this is my source code:
Controller:
public ActionResult Index()
{
List<Order> list = new List<Order>();
for (int i = 0; i < 20; i++)
{
list.Add(new Order());
}
list = DatabaseService.DBGetList<Order>("Order");
List<Order> orders = new List<Order>();
for (int i = 0; i < list.Count(); i++)
{
if (list[i].numberOfCompleted == 0)
{
orders.Add(new Order() { id = list[i].id, numberOfCompleted = list[i].numberOfCompleted, customerName = list[i].customerName, foods = list[i].foods });
}
}
return View(orders);
}
Order.cs
public List<Food> foods { get; set; }
public string customerName { get; set; }
public int id { get; set; }
public long totalCost = 0;
public int numberOfCompleted { get; set; }
View
#foreach (var item in Model)
{
<!--Display attributes-->
<!--Display Complete button-->
<div class="media-container-column col-12 col-lg-3 col-md-4">
<div class="mbr-section-btn align-right py-4">
<button class="btn btn-primary display-4 remove"
data-toggle="modal"
data-target="#exampleModal"
type="submit"
>Complete</button>
</div>
</div>
</div>
</div>
</section>
}
I want when clicking the Complete button, the numberOfComplete attribute will be assigned with food.Count(). What do I have to do to achieve this?

Answer 1

First you create a post form in view page of index action. Change this to your index.cshtml file.
#foreach (var item in Model)
{
<!--Display attributes-->
<!--Display Complete button-->
<div class="media-container-column col-12 col-lg-3 col-md-4">
#Html.BeginForm("Index","Controller",FormMethod.post)
{
<input type="text" name="id" display="none" value="#item.id"/>
<div class="mbr-section-btn align-right py-4">
<button class="btn btn-primary display-4 remove" data-toggle="modal" data-
target="#exampleModal" type="submit">Complete</button>
</div>
}
</div>
}
Then create post action method of index.
[HttpPost]
public ActionResult Index(Order obj)
{
Order order=Order().Find(x=>x.id=obj.id);
order.numberOfComplete = order.food.count();
return view();
}