Update App.config file value
Description: Save value to the App.config file’s appSettings section
Link: http://www.codekeep.net/snippets/00e10a84-b264-437d-85bd-0ce6fe8fa620.aspx
System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.AppSettings.Settings.Remove("test");
config.AppSettings.Settings.Add("test", "testValue");
config.Save(ConfigurationSaveMode.Modified);
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