Post button actions back to same controller?

I have a HomeController, which invokes a view (Index.cshtml). In a form in this view, I have two simple buttons: like this:

<formmethod="post">

   <buttontype="submit">AUTO</button>   

   <buttontype="submit">OUT</button>

</form>

What is the correct method to wire these up to invoke two different methods (Auto and Out) in the Homecontroller?