I was doing a project that I will share will you all soon, and was running into an error whereby SpecRun was complaining to me that a file was locked by another process.

So I wanted to recreate this scenario and debug it to see what the problem was, so a quick Google on how to lock a file returned some strange results relating to securely locking a file with a password etc, a quick look on stackoverflow only resulted the code to lock a file.

So thought it would be quicker and simpler to write my own simple app to lock a file, and you can download it here (Click File>Download), its uploaded as a text file so you will have to rename to .exe in order to run it.

A few examples of where this application could be of use to you:-

• Does you application write to a log file? If its threaded does each instance write to same file? Have the developer coded it to ignore locks? Use the app and find out.
• Instance I had, several instances were trying to read and write to the same config file, was clearly a race and some instances lost and throw an error.
• Upload dialog, see how your application behaves when trying to upload a locked file.

And no doubt lots of other uses.

Enjoy.