Emulator Control - Which Framework?

With this program I sent the video to, the man can automate the program using ldplayer.
Which framework do you think they are using to automate Android emulators in this way?

I searched a little and found something called Appium.

What is your opinion?
I want to control android emulator with .Net.

Not sure by looking at the videos. But from a github search for libraries, appium does seem to be the dominant library in the space.

From the github page:

"You can write tests with your favorite dev tools using any WebDriver-compatible language such as Java, Objective-C, JavaScript (Node), PHP, Python, Ruby, C#, Clojure, or Perl with the Selenium WebDriver API and language-specific client libraries."

Says it includes C#

I would go ahead and try appium since it seems to be the most popular.