c# - Why the program generate a new configuration file? -


i changing configuration file in visual studio,the program language c#,and enviroment .net framework 4.0+windows 7.this code:

        #region change configuration file         /// <summary>         ///          /// </summary>         /// <param name="createdtime"></param>         [testcase("2015-06-12 14:37:59")]         public void changeconfiguration(string createdtime)         {             string str = system.environment.currentdirectory+@"\app.config";                string appdomainconfigfile = appdomain.currentdomain.setupinformation.configurationfile;             configuration config = configurationmanager.openexeconfiguration(str);                       appsettingssection appsettings = (appsettingssection)config.getsection("appsettings");                         appsettings.settings.remove("querytime");             appsettings.settings.add("querytime", createdtime);              config.save();             configurationmanager.refreshsection("configuration");         }         #endregion

and program generate new configuration file named:app.config.config.how being?i want modify querytime in original file.

ps:this app.config:

<?xml version="1.0" encoding="utf-8"?> <configuration>   <appsettings>     <add key="interval" value="5"/>     <add key="querytime" value="2015-06-10 14:37:59"/>     <add key="_timerinterval" value="5000"/>   </appsettings> </configuration>

this because openexeconfiguration takes exe name input , automatically looks config file name exe.config (this default format). -

   // configuration file. file name has    // format appname.exe.config.   system.configuration.configuration config = configurationmanager.openexeconfiguration(exepath);

you can check sample code here - https://msdn.microsoft.com/en-us/library/ms224437(v=vs.110).aspx

so in case remove .config @ end of file name - 

    #region change configuration file     /// <summary>     ///      /// </summary>     /// <param name="createdtime"></param>     [testcase("2015-06-12 14:37:59")]     public void changeconfiguration(string createdtime)     {         string str = system.environment.currentdirectory+@"\app";  //remove .config           string appdomainconfigfile = appdomain.currentdomain.setupinformation.configurationfile;         configuration config = configurationmanager.openexeconfiguration(str);                   appsettingssection appsettings = (appsettingssection)config.getsection("appsettings");                     appsettings.settings.remove("querytime");         appsettings.settings.add("querytime", createdtime);          config.save();         configurationmanager.refreshsection("configuration");     }     #endregion

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