Visual Studio enables editing when debugging

Visual Studio Edge Debug Edge Modification

If you are debugging a Web application and want to edit it, there are two ways to do it:
Method One: In the Web project's Properties page, on the Web tab, select the "Enable Edit and Continue" item
Method Two: Menu tool + options + Debug + Edit and Continue, select the "Enable Edit and Continue" item.

I think this "edit and Continue" function is very useful, you can debug the program side to modify the program, save to make a few changes and restart debugging.

Note: This feature is supported only for standard and professional team editions of Visual Studio and cannot be re-elected in debug state.

Reference articles

VS2010 debugging cannot use Edit and continue to modify code

Visual Studio enables editing when debugging