CodeBehind is a modern full-stack web framework under ASP.NET Core. CodeBehind was developed by Elanat in 2023 and competes with Microsoft's default web frameworks (ASP.NET Core MVC and Razor Pages and Blazor). CodeBehind is an engineering masterpiece that simultaneously provides the possibility of development based on MVC, Model-View, Controller-View, only View and Web-Forms. The type of structure and naming in CodeBehind is a nostalgia that reminds of former Microsoft Web-Forms. CodeBehind has nothing to do with the old web-form in .NET. In CodeBehind, you can use Razor syntax (@Razor) and standard syntax (<%=Standard%>). CodeBehind is .NET Diamond! In many scenarios, CodeBehind performs better than the default frameworks in ASP.NET Core.