Authorization error in windows 7 by updating configuration file

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C#

C#4.0

hello everyone

i am updating configuration file with the following function

private void UpdateConfig(string value)
        {
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            //ConfigurationManager.

            AppSettingsSection appSettings = config.AppSettings as AppSettingsSection;


            
            // Get the KeyValueConfigurationCollection  
            // from the configuration.
            KeyValueConfigurationCollection settings =
              config.AppSettings.Settings;

            // Display each KeyValueConfigurationElement. 
            foreach (KeyValueConfigurationElement keyValueElement in settings)
            {
                if (keyValueElement.Key == "dbConnectionString")
                {
                    keyValueElement.Value = value;
                }
            }

            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }

i am getting authorization exception by updating configuration file
i don't want to do that user manually change authorization on windows user level i want to make it correct in application kindly suggest me any solution.