How can I add values to my custom section in app.config?

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i want to store the value in custom section of app.config pragmatically in c# window form like that based on user at runtime on setting selection of user

XML

<guisetting>
  <username user="abc">
  <backgroundcolor>red<backgroundcolor>
  <fontsize>10<fontsize>
  <textcolor>yellow<textcolor>

  <username user="xyz">
  <backgroundcolor>blue
  <fontsize>13<fontsize>
  <textcolor>brown<textcolor>
  <backgroundcolor><username>
<guisetting>

i read many article but i not found exact solution for adding dynamic value to custom section of app.config.
can any body help me.
Thanks In Advance...

What I have tried:

i know how to read the value from custom section but i don't have an idea about how to add value at runtime

Posted 13-Jun-16 2:10am

Member 12540290

Updated 13-Jun-16 5:45am

Kornfeld Eliyahu Peter

v4

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Sergey Alexandrovich Kryukov 13-Jun-16 11:46am

What does it mean "dynamic value"? The config file is read-only, do you realize that? Is it fine with you?
If not, you have to use some other file.
—SA

F-ES Sitecore 13-Jun-16 12:07pm

You don't amend the config files at runtime, if you want to do that put your data in a normal xml file and update it using XmlDocument or whatever other method you prefer.

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Sergey Alexandrovich Kryukov · Accepted Answer · 2016-06-13T05:45:00

This is clearly and comprehensively explained here: https://msdn.microsoft.com/en-us/library/2tw134k3.aspx.

The problem is your question is that you show some XML fragment out of its context. We cannot see what you have really done. You have to show it starting from the <configuration> element, but you could shorten some irrelevant parts.

See also my comment to the question. If you mean something beyond read-only configuration, you have to use some other file, not standard config.

—SA