How to work with video memory?

Question

Video cards

Hello, the teacher asked the assignment (but we did not work with it).
The essence of the task is to write a number into the video memory, then add one more number to this number and display it on the screen. The bottom line is that the values ​​\u200b\u200bare stored only in the video card. I don’t know how to do this in c#, and our level is low.
Who knows how to write values ​​​​to the video card, and then read it?

Thank you in advance.

Answer 1

https://www.cyberforum.ru/csharp-net/thread2454959.html
https://habr.com/ru/post/124873/