How C # writes the Exe.config file

 Public Static stringGetconnectionstringsconfig (stringconnectionname) {            stringFile =System.Windows.Forms.Application.ExecutablePath; System.Configuration.Configuration Sysconfig=configurationmanager.openexeconfiguration (file); stringConnectionString =Sysconfig. Connectionstrings.connectionstrings[connectionname].            Connectionstring.tostring (); returnconnectionString; }         Public Static voidUpdateconnectionstringsconfig (stringNewName,stringnewconstring) {            stringFile =System.Windows.Forms.Application.ExecutablePath; Configuration Sysconfig=configurationmanager.openexeconfiguration (file); BOOLexist =false; if(Sysconfig. Connectionstrings.connectionstrings[newname]! =NULL) {exist=true; }            if(exist) {sysconfig.            ConnectionStrings.ConnectionStrings.Remove (NewName); } connectionstringsettings mysettings=Newconnectionstringsettings (NewName, newconstring); Sysconfig.            CONNECTIONSTRINGS.CONNECTIONSTRINGS.ADD (mysettings); Sysconfig.            Save (configurationsavemode.modified); Configurationmanager.refreshsection ("ConnectionStrings"); }

How C # writes the Exe.config file