Send a list with multiple items to the controller

If you want to pass the list to View to change only in submit, I think the best option would be to do the foreach() only with the selected items, like this:

public ActionResult Create(List<MyClass> list) {
    foreach (var item in list.Where(l => l.Selected)) {

            // realiza ações

    }
}

This way will scroll through the list only those that are selected.

The most interesting thing would be to know how your Controller and View are doing. But I will try to show you through a practical example:

Let's imagine that you need the user to select only the products they want to buy and send to the server. However, you only need to know what is the Id of each selected product to make the purchase in fact.

The Class Product would look like this:

namespace AntonioFilho.Models
{
    public class Product
    {
        public int Id {get; set;}
        public string Name {get; set;}
        public decimal Price {get; set;}
    }
}

Or Controller would look something like this:

namespace AntorioFilho.Controllers
{
    public class ProductController : Controller
    {
        // Camada fictícia apenas para ilustração ;)
        private IProductRepository _repository = new ProductRepository();

        public ActionResult Index()
        {
             return View();
        }
        public ActionResult Buy()
        {
            IList<Product> products = _repository.GetAllProducts();
            return View(products);
        }

        [HttpPost, ValidateAntiForgeryToken]
        public ActionResult Buy(List<Product> products)
        {
            bool ok = _repository.SelectProducts(products);
            return RedirectToAction("Index");
        }
    }
}

Already your View would be like this:

@model IList<Product>

@using (Html.BeginForm("Buy", "Product", FormMethod.Post))
{
    @Html.AntiForgeryToken()
    <table>
        <tr>
            <th><input type="checkbox" id="checkall" /></th>
            <th>Product name</th>
        </tr>
    @for(int i = 0;i < Model.Length;i++)
    {
        <tr>
            <td>
                @Html.HiddenFor(m => Model[i].Price, new { @disabled = "disabled", @id = String.Format("product{0}", i) })
                @Html.CheckboxFor(m => Model[i].Id, new { @class = "check", @idFake = String.Format("product{0}", i) })
            </td>
            <td>@Model[i].Name</td>
        </tr>
    }
        <tr>
            <td colspan="2">
                <input type="submit" value="comprar" />
            </td>
        </tr>
    </table>
}

<script>
    $(document).ready(function() {
        $('.check').click(function(){
            var id = $(this).attr('idFake');
            if(this.checked)
                $('#' + id).removeAttr('disabled');
            else
                $('#' + id).attr('disabled', 'disabled');
        });
    });
</script>

I hope I helped \o /