c# - How to monitor xml file for (add - edit - delete ) node(s) -

in solution have 2 projects (windows service , wpf mange service) , have sitting file (xml) service use ask :

i want know when user make change in xml file out restart service , know xml node(s) has changed

i have searched lot , found solution through filesystemwatcher

listens file system change notifications , raises events when directory, or file in directory, changes.

but how know xml node(s) has changed

thanks

i keep copy of original xml , run compare when filesystemwatcher triggers. have @ efficient algorithm comparing xml nodes suggestion on comparing xml nodes.

file watcher example

string folderlocation = system.configuration.configurationmanager.appsettings["folder_location"].tostring();              _watcher = new system.io.filesystemwatcher();             _watcher.path = folderlocation;             _watcher.includesubdirectories = false;             _watcher.notifyfilter = notifyfilters.size;             _watcher.changed += new filesystemeventhandler(onfilechanged);             _watcher.enableraisingevents = true;  private void onfilechanged(object sender, filesystemeventargs e)         {             string file = e.fullpath; ...