I want to design my own search engine application, where all the results are displayed to the user on one single page (from Google/Bing etc) unlike Google where it is displayed on different pages.
Does there exist any such API's which can get me all those results?
PS. I am using C#, and considering the IEnumerator interface for this?
What you can do is to fetch data from different APIs (bing/google etc) and then display it to the user in one flow. Otherwise, crawling search engines is totally illegal.
For Google, you can go to Google Custom Search API or if you have products to search then Google Shopping API.
For Bing, there is a simple and straightforward API.