Save web settings to config file

From searching I'm confused whether to use ConfigurationManager or WebConfigurationManager. Neither works.

Using WebConfigurationManager is the preferred way to work with configuration files related to Web applications. For client applications, use the ConfigurationManager class.

Share your converted c# code if you need any further assistance

My code - the error is that there is no definition for 'Save'

      protected void onGoingFlying_CheckedChanged(object sender, EventArgs e)
      {
         if (goingFlying.Checked)
         {
            ConfigurationManager.AppSettings["GoingFlying"] = "True";
         }
         else
         {
            ConfigurationManager.AppSettings["GoingFlying"] = "False";
         }
         ConfigurationManager.Save();
      }

I am not 100% sure, but it looks like you need to use

 configFile.Save(ConfigurationSaveMode.Modified);  

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https://docs.microsoft.com/en-us/dotnet/api/system.configuration.configurationmanager.appsettings?view=dotnet-plat-ext-6.0

The full example from that article is

static void AddUpdateAppSettings(string key, string value)  
        {  
            try  
            {  
                var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);  
                var settings = configFile.AppSettings.Settings;  
                if (settings[key] == null)  
                {  
                    settings.Add(key, value);  
                }  
                else  
                {  
                    settings[key].Value = value;  
                }  
                configFile.Save(ConfigurationSaveMode.Modified);  
                ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);  
            }  
            catch (ConfigurationErrorsException)  
            {  
                Console.WriteLine("Error writing app settings");  
            }  
        }

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This seems to pertain to console apps, I've tried changing to WebCOnfig (its a website) but cant get anything to work.

A

Actually got this working now. Here is my solution in case anyone else has a similar issue.

      private void UpdateAppSettings(string key, string value)
      {
         System.Configuration.Configuration configFile = null;
         configFile = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~");

         var settings = configFile.AppSettings.Settings;
         settings[key].Value = value;

         configFile.Save(ConfigurationSaveMode.Modified);
         ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
      }

This is called passing in the Key and value:
UpdateAppSettings("GoingFlying", "True");

Andy