how to update App.config

how to update App.config. these two articles are one good option.

1. ConfigurationManager.RefreshSection Method (String) -- basic function

   this code snippet has basic logic to use app.config file.

2. How to modify / delete keys the AppConfig file

   syntax on how to remove, add and modify key pairs.

3. C# - app config doesn't change

   this explains why app.config file is not changed in debugging mode under Visual Studio IDE.

4. Microsoft Enterprise Library for .NET 2.0: Configuration
5. Read/Write App.config with .NET 2.0/Enterprise Library
6. Being Scott Densmore on Enterprise Library

Here we can find generic answers to resolve some confusions.

1. App.config reloading
2. Why my changes of AppSettings in App.config is not taken into account in run-time? (Console Application)
3. Changing App.config at Runtime
4. Setting useLegacyV2RuntimeActivationPolicy At Runtime
5. How to: Configure an App to Support .NET Framework 4 or 4.5
6. App.Config Files
7. Writing to Your .NET Application's Config File
8. Building a better .NET Application Configuration Class - revisited
9. Is it possible to read runtime changes in App.config?
10. Switching Configuration Files for Debug and Release Modes
11. Why my changes of AppSettings in App.config is not taken into account in run-time? (Console Application)

more research papers below:

12. Modify App Configuration while running application , C#.NET
13. Refreshing the .NET Application to Read Modified Configuration Files Values
14. Refresh AppSettings keys
15. ConfigurationManager RefreshSection not "refreshing"
16. How to Change .NET Configuration Files at Runtime (including for WCF)
17. How do I reload/refresh app.config?