A few days ago, I suddenly came up with an idea. I used C # And SQLite to develop an Ajax notepad. After that, my friend told me to take a look at it and it was not easy to use it. Debugging can be performed in vs2005, but attempt to write a readonly a database is always displayed when new records are saved to the SQLite database. A calm analysis: I have not set the database to read, but sqlite3.exe can be used to implement the crud (create read update delete) operation, which should not be a database problem.ProgramIt can be used on my machine.CodeNo problem, the most likely problem is the system permission problem. Solution: Control Panel> folder option> use simple file sharing (recommended) to remove the preceding check box. Find the folder where the SQLite database is located, right-click, choose Properties> Security, and add write permissions to the users user group. Try again to solve the problem.