ASP.NET VB.NET Search button on masterpage doesn’t navigate to the correct directory

I have a search input and button in a masterpage that I would like to redirect to the same directory that the user is currently in. If user is in myurl.com/Manage/default.aspx, i would like the redirect to be myurl.com/Manage/search.aspx. If the user is in myurl.com/Field/default.aspx, I would like the redirect to be myurl.com/Field/search.aspx.

receive requests in web servce rest in c #?

I have a web service api rest project in C # (basic) in VS, I program a POST method that does nothing at the moment, it only validates if information arrives or that I think it does ha, what I want to know is: when I send a Json chain from a client program, to be able to debug the reception of the request sent from my web service.
I want to see how my request arrives.