ASP.NET WebForms : how to POST a request and read the Received Response data

I wish to know how we can read the POST response in the below scenario… Specifically, is there a way to achieve the below scenario:

I have one (4.6) webforms application: “App1”

It has 2 pages:

  • “Page1.aspx”
  • “Page2.aspx”

App1------> POSTs data to some URL (ThirdParty)---- from Page1.aspx
(using WebRequest Class)

That third Party app Sends Data (JSON format ) back to the URL we
specify. (this is Page2.aspx )

Now, our App1 should read that data sent to Page2.aspx.

How to achieve this control flow?

Many Thnaks!