How to Update (Add/Modify/Delete) keys in AppSettings section of web.config at runtime

Question

I like to Update keys/Values defined in AppSettings section of Web.config at runtime. however I DO NOT want to actually save them to Web.conf

Answer 1

You need to make use of WebConfigurationManager.OpenWebConfiguration()

Configuration config = WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath);
config.AppSettings.Settings.Remove("Variable");
config.AppSettings.Settings.Add("Variable", "valyue");
config.Save();