I got this following error “The SMTP server requires a secure connection or the client was not authenticated. The server response was:5.5.1 authentication Required” while attempting to send mail using asp.net c# (i.e Google authentication required).
In this article, I will show you how to create a website url crawler using asp.net c#. you can crawl web pages and extract data from a website by inputs the url. It requests the web page and then get response the data programmatically.