Couldn't save App.Config file modified configurations

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C#

application

Hello Friends,

I'm trying to modify my app.config file by editing values in it during runtime. I'm not able to see the changes in my app.config File. This is the function that takes a key-value pair and saves the changes in the configuration file. Please let me know if I need to change anything in this function to make it work.

public void SetAppSettingsVal(string node, string newValue)
        {
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            config.AppSettings.Settings[node].Value = newValue;
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }