How to modify a key in web.config file through the code?

Question

If I have in the web.config file of web application :

<appSettings>
    <add key="DD" value="567_Access"/>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>
</appSettings>

I know how to read the data in appSettings sections like this :

 string accessD = ConfigurationManager.AppSettings["DD"];

But I want to know how to Modify (Set) the value of a key in appSettings Through the code ?

(I want through a specific check to this value to stop the application under some circumstances)

http://stackoverflow.com/questions/719928/how-do-you-modify-the-web-config-appsettings-at-runtime — Alex, Dec 23 '16 at 13:27

score 2 · Accepted Answer · answered Dec 23 '16 at 13:50

System.Configuration.ExeConfigurationFileMap configFile = new System.Configuration.ExeConfigurationFileMap();
configFile.ExeConfigFilename = "ConsoleTester.exe.config";  //name of your config file, can be from your app or external
System.Configuration.Configuration config = System.Configuration.ConfigurationManager.OpenMappedExeConfiguration(configFile, System.Configuration.ConfigurationUserLevel.None);
System.Configuration.KeyValueConfigurationCollection settings = config.AppSettings.Settings;
settings["DD"].Value = "007_Access";
config.Save();

How to modify a key in web.config file through the code?

1 Answers1