I want to copy an xml file from the main directory to bin\\Debug after building the project, but my solution doesn\'t work. I edited .csproj file a
Your destination folder is (most likely) wrong. If you specify it with a leading backslash, it is actually just a shortform for (making it effectively an absolute path, like C:\bin\Debug).
Either use bin\Debug, or better yet use the OutputPath variable, which is set to either bin\Debug or bin\Release depending on your build configuration.
Example: