What do you mean by Code Refactoring?

Its a feature of Visual Web Express & Visual Studio 2005. Code Refactoring Code Refactoring enables you to easily and systematically make changes to your code. Code Refactoring is supported everywhere that you can

write code including both code-behind and single-file ASP.NET pages. For example, you can use Code Refactoring to automatically promote a public field to a full property.