The ActionLink method takes the arguments 'Text', 'Action', 'Controller'
Based on the parameters you have passed to it, it's looking for a method called
contact on your Home controller. If this method doesn't exist, you'll see the 404 error.
Make sure that the method exists on the controller. Also, check your casing, your controller method should really be
Contact
and you should change your ActionLink accordingly. e.g
Html.ActionLink("Contact", "Contact", "Home")