What do you mean by โSolid Principlesโ in ASP.NET Framework?
https://www.c-sharpcorner.com/UploadFile/damubetha/solid-principles-in-C-Sharp/
SOLID is not directly linked to ASP.Net or any other framework. These are design principle you can use with any language. It gives you the guidance to write a better, clean and managable code.