Android: How to call a website without loading it on app

I wrote a web application in c# on visual studio, that runs a website which I can pass data to. How can I, in my android application, call this website URL with my appended data without doing any extra steps?

I have been able to visit the website, but it loads the website on my application, I want to pass data to this website every second, so loading a web page every time is not the direction I'd like to head in.

How can I just send the data to the website, loading as little data past that as possible?

(When I write, while loading as little data as possible, I mean, that I don't want my application to visibly load the website and display it, I just want to call the website)

Thank you for reading, and any direction you can provide for me!