C#: How to login to a website and then web scrape data

I have no idea where to start with this problem. I am trying to login into my school website via my login and then web scrape data to send data back to myself(my grades). What is the easiest way to achieve this in C#.

Additional: Tutorials or wikis would be helpful as I am a beginner however it is not necessary.

Additional pt 2 (Not necessary but helpful): The ideal functionality for this program would be I send a text from my phone in the format (Class-Teacher) to "a server?", and it sends back my grades but I am also lost in how to set this up. Nonetheless, I can figure this out later but help would be appreciated