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Dynamically add and remove key-value pairs from a section in app.config

My XML file looks like:
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="databaseTypes" type="System.Configuration.NameValueSectionHandler" />
<section name="dataDictionary" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<databaseTypes>
<add key="ExampleServerPrefix_T" value="Connection_String_For_ExampleServer" />
<add key="ExampleServer2Prefix_T" value="Connection_String_For_ExampleServer_2" />
<add key="COPYLIVE_" value="ODBC;DSN=s2;" />
</databaseTypes>
<dataDictionary>
<!-- Other pairs in this section -->
</dataDictionary>
</configuration>
What I am trying to achieve is to be able to add and remove key-value pairs from the databaseTypes section. So for example to would like to dynamically add a run time a new pair <add key="blah" value="ODBC;blah" />.
First its useful to know is this possible? If so how because I can't find any relevant documentation or examples on how this is done.

Ben,
Here are two articles that will help you with adding key/value pairs to the config:
Writing custom sections to app.config
Writing custom sections into app.config
Update AppSettings and custom configuration sections in App.config at runtime
http://yizeng.me/2013/08/31/update-appsettings-and-custom-configuration-sections-in-appconfig-at-runtime/

How to change default Bucket in app.config

My App.Config looks like this.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="couchbaseClients">
<section name="couchbase"
type="Couchbase.Configuration.Client.Providers.CouchbaseClientSection, Couchbase.NetClient"/>
</sectionGroup>
</configSections>
<couchbaseClients>
<couchbase useSsl="false">
<servers>
<add uri="http://localhost:8091/pools"></add>
</servers>
<buckets>
<add name="CBMigration" useSsl="false">
<connectionPool name="custom" maxSize="10" minSize="5"></connectionPool>
</add>
</buckets>
</couchbase>
</couchbaseClients>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
</startup>
</configuration>
In that i given bucket name is "CBMigration" but still the entries are in default bucket only.
And my c# code for initializing cluster is _instance = new Cluster("couchbaseClients/couchbase");
I need to make the bucket as "CBMigration" for the Cluster i initialized using the app.config.
Where i am going wrong ?
Please help me...

I think there's a gap in documentation there. The bucket entries in are only used to provide customized defaults for the bucket's configuration. That is the use of ssl, connection pool tuning, etc...
But having just one bucket config entry like that doesn't actually change the behavior of OpenBucket(): the default bucket used by the client is always "default".
You still have to explicitly open the specific bucket you want, using OpenBucket(BucketName, BucketPassword)... It's just that once you do that, said bucket will be opened using tuning parameters found in its corresponding section in App.config instead of hardcoded default ones.
Does that make sense?

web.config c# .net web application

How to read a personal section in a web.config ?
<MyPersonalSection>
<add name="toto" enable="true" URL="http://localhost:43242" />
<add name="titi" enable="false" URL="http://localhost:98762" />
<MyPersonalSection/>
I'd like to get the enable value and/or URL value with the name value.
I also have this mistake : Unrecognized configuration section MyPersonalSection
I been trying
var config = ConfigurationManager.GetSection("MyPersonalSection");

Here is a cool example for that.

You don't need to write a custom configuration handler to get what you want. There are built-in configuration handlers that you can use if you simply want key-value entries. But, you'll have to use key instead of name and value instead of URL. For example:
<configuration>
<configSections>
<section name="MyPersonalSection" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<MyPersonalSection>
<add key="toto" value="http://localhost:43242" />
<add key="titi" value="http://localhost:98762" />
</MyPersonalSection>
</configuration>
And you can access them via code:
var myValues = ConfigurationSettings.GetConfig("MyPersonalSection") as NameValueCollection;
var url = myValues["toto"];
I would suggest naming your keys in a way that makes it clear what the value should be, like "totoUrl" and "titiUrl".
If you want something other than string value pairs, you'll have to write your own custom handler.

You can add appSettings section in your web.config with key that you will need. For example:
<configuration>
<appSettings>
<add key="FirstUrl" value="http://localhost:43242"/>
<add key="SecondUrl" value="http://localhost:98762" />
</appSettings>
...
</configuration>
So, since aspx.cs file, you can declare directive
using System.Configuration;
And later, you can retrieve FirstUrl value in this way:
var myUrl = ConfigurationManager.AppSettings["FirstUrl"];

c# Application Configuration File: AppSettings Reads Empty?

This is my first time using an XML config file. In the solution explorer I right click, add, new item, application config. file.
I then edited the file to read...
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="Key1" value="1000" />
</appSettings>
</configuration>
...and tried to access it with...
Int32.Parse(ConfigurationManager.AppSettings.Get("Key1"));
...but it says that the parameter is null. I looked at just ConfigurationManager.AppSettings and it's AllKeys property has dimension 0.
What am I doing wrong?
Thanks!

Right-click on your project, choose Properties>Settings tab and edit your settings there because the config file is not the only place these values are stored at.
In your code use Settings.Default.MySetting to access the settings.
You'll need to add using MyProjectName.Properties; to your using statements in order to access the settings this way or you'll have to fully qualify it as MyProjectName.Properties.Settings.Default.MySetting...

I know this is super old but I just encountered this opening an old project. A reference to System.Configuration was missing.

To ensure get information from App.config using ConfigurationManager.AppSettings["<Key name>"]; be sure to set your values inside <appSettings> section.
Example:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
<appSettings>
<add key ="IntervalSeconds" value ="60000"/>
<add key ="OutputPathLog" value ="\\myserver\hackingtrack\Projects\Log\"/>
<!--Jorgesys si Elenasys sunt puisori-->
<add key="InputFeeds1" value="https://cld.blahbla.com//portadaKick.json" />
<add key="InputFeeds2" value="https://cld.blahbla.com//portadaKick.json" />
<add key="InputFeeds3" value="https://cld.blahbla.com//portadaKick.json" />
</appSettings>
</configuration>
Retrieving values:
string intervalSeconds = ConfigurationManager.AppSettings["IntervalSeconds"];
string inputFeeds1 = ConfigurationManager.AppSettings["InputFeeds1"]; ;
string inputFeeds2 = ConfigurationManager.AppSettings["InputFeeds2"];
string inputFeeds3 = ConfigurationManager.AppSettings["InputFeeds3"];

How can I access web.config from an ASP.NET Custom Control?

Inside my web.config file I've got code like this:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
...
<section name="UninstallSurveySettings" type="dashboard.UninstallSurveyConfig" />
</configSections>
...
<UninstallSurveySettings>
<add key="fileLocation" value="C:\inetpub\wwwroot\output\" />
</UninstallSurveySettings>
...
</configuration>
I need to be able to access this field from my custom control. The control can be dropped into any website and needs to check that site's web.config for the fileLocation value in UninstallSurveySetting.
I've tried a couple different approaches with no luck. Any help on this would be greatly appreciated.

Much easier to use AppSettings.
Web.config:
<configuration>
<appSettings>
<add key="fileLocation" value="C:\inetpub\wwwroot\output\" />
</appSettings>
</configuration>
Code:
string location = System.Configuration.ConfigurationManager.AppSettings["fileLocation"];
If your section will become more complex, then:
var section = (NameValueFileSectionHandler)ConfigurationManager.GetSection("UninstallSurveySettings");
if (section != null)
{
// access section members
}
P.S.
Maybe you want to use ConfigurationSection class instead of handler.

In ASP.NET MVC 3 the tag cannot be a direct child of (it results in a configuration error).
How about adding your key to the section. Then you can easily access it via the ConfigurationManager.AppSettings collection.

using System.Configuration.ConfigurationManager and you will be able to get what you want from the web.config

I was able to solve this by creating a configuration class for it and placing this code in the web.config:
<section name="UninstallSurveyConfig" type="dashboard.UninstallSurveyConfig" />
..
<UninstallSurveyConfig dirFileLocation="C:\inetpub\wwwroot\build\output" webFileLocation="~/output" />