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How to write to the app.config file?

I've got a windows forms application and I would like to save a string in the app.config file.

I've googled this and can't find any example code that works.

All I want to do is read a string in when I load my form, and save it after a particular action. The idea is just to persist a setting on the form so the user doesn't have to keep re-entering it each time the form opens.

If I set the value manually I find the string can be read with no problems, but trying to write it just doesn't seem to save it.

Here is my settings file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="LastSearchPath" value=""/>
  </appSettings>

Here is my current code:

            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);            
            config.AppSettings.Settings["LastSearchPath"].Value = txtPath.Text;
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");

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Om Prakash
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Why not you try to save settings in a Database table, you can create a tblAppSettings (example) table in Database and once your application loaded, you can retrive all settings from table and store all config values as xml on any physical path, and can retrieve information whenever required.
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