@Vijayakumar Ganji Thanks for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
.NET and ASP.NET are related but different technologies. .NET is a general-purpose development framework that can be used to build a wide range of applications, while ASP.NET is a web application framework built on top of .NET that is specifically designed for building web applications.
Current latest Version of .NET is v8.0 and ASP.NET is V4.8. If you are using ASP.NET framework you don't need to upgrade as the v4.8 is latest.
- ASP .NET framework.
Feel free to reach back to me if you have any further questions on this.