MVC actionlink parameter never sending

Question

Can anyone tell me why my parameters in the following code are always null when the controller action is called:

<% foreach (var row in Model) { %>
     <tr>
        <td><%=Html.ActionLink("Edit", "Edit", "Customer", new { controller = "Customer", action = "Edit", id = row.CustomerID })%>|
            <%= Html.ActionLink("Sales", "List", "Sale", new { controller = "Sale", action = "List", id = row.CustomerID }, null)%></td>
        <td><%= Html.Encode(row.CustomerID)%> </td>
        <td><%= Html.Encode(row.FirstName)%> </td>
        <td><%= Html.Encode(row.LastName)%> </td>
        <td><%= Html.Encode(String.Format("{0:g}", row.DateOfBirth))%></td>
        <td><%= Html.Encode(row.Address)%> </td>
        <td><%= Html.Encode(row.Phone)%> </td>
    </tr>



<% } %> 

Controller code:

public class SaleController : Controller
{

    public ActionResult List(int CustomerID)
    {
        SaleListModel SaleList = SaleServices.GetList(CustomerID);
        return View(SaleList);
    }

}

Answer 1

You are sending a parameter named id, but your controller actions are looking for a parameter named CustomerID. These need to match.

Answer 2

Action parameters are bound by name, not by position or type. Therefore you should change id to CustomerID in your calls to Html.ActionLink:

    <td><%=Html.ActionLink("Edit", "Edit", "Customer", new { controller = "Customer", action = "Edit", CustomerID = row.CustomerID })%>|
        <%= Html.ActionLink("Sales", "List", "Sale", new { controller = "Sale", action = "List", CustomerID = row.CustomerID }, null)%></td>

Answer 3

Use the following instead. You're specifying parameters (Controller/Action) that aren't necessary.

<%= Html.ActionLink("Edit", "Edit", "Customer", new { id = row.CustomerID })%>|
<%= Html.ActionLink("Sales", "List", "Sale", new { id = row.CustomerID })%>