This is a very simple URL shortener built in the ASP.NET MVC and Web API frameworks. This code is part of a tutorial: https://ducode.org/tutorial-url-shortener-in-asp-net.html https://file.io/OCNIL8.
https://www.codeproject.com/Articles/996483/Tutorial-creating-a-URL-shortener-using-ASP-NET-We
For installation instructions, read the article mentioned above.