Using Html.ActionLink to call action on different controller

Question

What you want is this overload :

//linkText, actionName, controllerName, routeValues, htmlAttributes
<%=Html.ActionLink("Details", "Details", 
    "Product", new {id = item.ID}, null) %>

With that parameters you're triggering the wrong overloaded function/method.

What worked for me:

<%= Html.ActionLink("Details", "Details", "Product", new { id=item.ID }, null) %>

It fires HtmlHelper.ActionLink(string linkText, string actionName, string controllerName, object routeValues, object htmlAttributes)

I'm using MVC 4.

Cheerio!

I would recommend writing these helpers using named parameters for the sake of clarity as follows:

@Html.ActionLink(
    linkText: "Details",
    actionName: "Details",
    controllerName: "Product",
    routeValues: new {
        id = item.ID
    },
    htmlAttributes: null
)

If you grab the MVC Futures assembly (which I would highly recommend) you can then use a generic when creating the ActionLink and a lambda to construct the route:

<%=Html.ActionLink<Product>(c => c.Action( o.Value ), "Details" ) %>

You can get the futures assembly here: http://aspnet.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=24471