When the app.config compile,its name will change into project.exe.config and copy itself to another place.
When I use
FileInfo file=new FileInfo("app.config")
to get the directory, it will get the directory of project.exe.config. But I want ot get the directory of app.config.
AppDomain.CurrentDomain.SetupInformation.Configura tionFile is also the same.
How can I do?
  Thanks for you help.

Why don't someone give me response ? Am not I express distinct ?

Well it's hard to see why what you've got isn't helping.

AppDomain.CurrentDomain.ApplicationBase gets the application folder's name, or use FileInfo with AppDomain.CurrentDomain.SetupInformation.Configura tionFile and then use the Directory property.

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Joe (Microsoft MVP - XML)