I know this does not work but i was hoping to get something like this to work in my HTML View using MVC C#

I’m trying to make a website in HTML to calculate a person’s BMI and in the calculation part, I will use code in C#, how can I combine these two steps and put them on a single website?

I am trying to get the link to the pdf in:
https://api3.dublin.oslobors.no/v1/newsreader/attachment?messageId=60342&attachmentId=60624
but cannot find it (expecting something like http://XXXXX/yyyyy.pdf ) even in the “Network” tab of the “Inspect” page on any browser as it immediately download the file. Ultimatly I am trying to save the file via C# using WebClient.DownloadFile() but that requires a file link rather than this redirection link. If someone could point me to what type of link this is called/what function should i use then i can do my research from there. Thanks!

I need some help with Crestron Construct and SIMPLE#/C#/HTML5. I also want to know how to use a .cs file in SIMPLE# or C#.