gistfile1.cs

public static class MyObjectManagerExtensions
{
    public static IEnumerable<selectlistitem> AsSelectList(this IEnumerable<myobject> list, int? value)
    { 
        return (from item in list
                select new SelectListItem
                { 
                    Selected = value.HasValue && item.Id == value.Value,
                    Text = item.Name,
                    Value = item.Id.ToString()
                });
    } 
}