No, React and ASP.NET are different technologies that serve different purposes. React is a JavaScript library for building user interfaces, while ASP.NET is a web application framework for server-side programming. Both technologies can be used to create powerful and dynamic web applications.
That said, React may be better suited for building the front end of a web application, while ASP.NET may be better suited for creating the server side of a web application. Ultimately, which technology is best for any particular project will depend on the specific requirements of the project.