C #-Use ConfigurationManager to save data to app. Config

1. ConfigurationManager namespace: Using System.Configuration;

2. To is able to save you has to use a configuration object returned by the Openexeconfiguration Method

//Create The ObjectConfiguration config =configurationmanager.openexeconfiguration (configurationuserlevel.none);//Make changesConfig. appsettings.settings["Username"]. Value =Txtusername.text;config. appsettings.settings["Password"]. Value =txtPassword.Text;//save to apply ChangesCONFIG. Save (configurationsavemode.modified); Configurationmanager.refreshsection ("appSettings");

3. When you run the your application with F5,

• Your code is compiled,
• bin bin\Debug The executable is copied to the or subdirectory of your source code directory,
• Your app.config yourexecutable.exe.config is copied as to that directory, and
• Your executable is started in that directory.

Thus, your application uses the  yourexecutable.exe.config  in the  bin  or  bin\debug  directory, and it is  there  that  ConfigurationManager  saves The changes, not in your source code directory. This won ' t is a issue after deploying your application, because then, changes'll go to  yourexecutable.exe.co Nfig  in The deployment directory, which is what you want.