How to get all the websites in C#

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Hey all,
I am making a program in which it gets all the websites in one search page and gets the url or those websites then it will show all of the websites in a text box. Not a web browser.
I mean like when Client Enters a search My program will write all the websites names. Using Google. Like imagine in google i enter 'Hello'. Then my tool finds all websites in the page and lists them in a text box

How can i do that