App.Config change value
app-config, c#
Solution
You cannot use AppSettings static object for this. Try this
string appPath = System.IO.Path.GetDirectoryName(Reflection.Assembly.GetExecutingAssembly().Location);
string configFile = System.IO.Path.Combine(appPath, "App.config");
ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap();
configFileMap.ExeConfigFilename = configFile;
System.Configuration.Configuration config = ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);
config.AppSettings.Settings["YourThing"].Value = "New Value";
config.Save();
Problem
This is my App.Config ``` <?xml version="1.0" encoding="utf-8" ?> <configuration> <appSettings> <add key="lang" value="English"/> </appSettings> </configuration> ``` With this code I make the change ``` lang = "Russian"; private void Main_FormClosing(object sender, FormClosingEventArgs e) { System.Configuration.ConfigurationManager.AppSettings.Set("lang", lang); } ``` But it not change. What I'm doing wrong?