@using System.ServiceModel.Syndication
@model IEnumerable<string>

@Html.ActionLink("Home", "List", "Product", null,
    new { @class = "btn btn-block btn-default btn-lg" })

@foreach (var link in Model)
{
    @Html.RouteLink(link, 
        new
        {
            controller = "Product", 
            action = "List", 
            category = link, 
            page = 1
        }, 
        new 
        {
            @class = "btn btn-block btn-default btn-lg" + (link == ViewBag.SelectedCategory ? " btn-primary" : "")
        })
}