The C# web page compiler uses AJAX+ASP.NET+VS2005 to develop and use help. Open the project directly with VS2005. If you have not installed Microsoft ASPAJAXExtSetup, please install and download this program first. The console program that implements C# syntax online compilation can display error messages and correct errors. The compilation information simulates the CMD platform. If it prompts that XXX cannot create the file when running, please go to the C drive WINDOWS directory system32 directory and click Properties Security to add the user. Everyone user permission is set to write. If you have other questions, you can contact me directly. Please do not enter statements that require input such as Console.Read() in the program.