how to scrape a website that you have to log in to?

[dmcgov]

i am trying to scrape coinbase.com but the first step is to log in. below is my code that i got from another site. so when i run the program, text appears in both textbox1 and textbox2 but it is just html. i need the program to render the window so i can get past the log in. can that be done?

note that i can't add the code to this window, it won't let me, so i am uploading a file that is the code for my windows form.

thoughts?