Save "app.config" configuration-file does not work

[Frygreen]

Dear experts, I want to update the configFile "app.config", but the "Save(..)" function does not work. Surprisingly, if I use the "SaveAs(..)" function (storing the config to another file),it works

    static void Main(string\[\] args)
    {
        // Open App.Config of executable
        Configuration config =ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        
        // Add a new Application Setting.
        config.AppSettings.Settings.Add("Modification Date",DateTime.Now.ToLongTimeString() + " ");

        // This does not update the file "app.config"
        config.Save(ConfigurationSaveMode.Full);

        // This correctly writes the file "Test.config"
        config.SaveAs("Test.config", ConfigurationSaveMode.Full);
    }

Question: What sense does the Save()-Method make? Can somebody help me? Thanks in advance

[Arun Jacob]

Is it throwing any error?Can you check if the file is readonly

Arun Jacob http://codepronet.blogspot.com/

[wasifmuneer]

The app.config file is not updated during execution of application,but it would be writing a .xml document in the bin folder with applicationname.exe(Xml configuration File), and each time your file will be updated but not app.config

[Frygreen]

No exception is thrown by the Save()-Method, the file is also not "read-only"

[Frygreen]

Sorry, of course, app.config is not expected to be updated, but I expect that in the bin-directory one of the files ".xx.exe.config" or "xx.vshost.exe.Config" should be updated at least. But none of them is updated. I', puzzled. What's the purpuse of the Save()-Method? Thanks for you kind replies