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cant read custom section from web config

Why can't I read this from my web config? When I used App.config it worked fine..
FundGroups = null
private static readonly NameValueCollection FundGroups =
(NameValueCollection)ConfigurationManager.GetSection("FundGroups");
Web.config:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="FundGroups" type="System.Configuration.NameValueSectionHandler" />
</configSections>
<FundGroups>
<add key="Group1" value="Value1" />
<add key="Group2" value="Value2" />
<add key="Group3" value="Value3" />
<add key="Group4" value="Value4" />
<add key="Group5" value="Value5" />
<add key="Group6" value="Value6" />
<add key="Group7" value="Value7" />
</FundGroups>
</configuration>
I found a possible duplication here. But the ConfigurationSettings.GetConfig seems to be obsolete and doesnt work for me

How to modify/update custom config section of app.config using c#

I am trying to save some configurations in app.config for my windows application.
I searched in Google for solution but not anything related to this. My requirement is I want to save/update the configurations in app.config using my windows application.
My schema will be like this:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="customAppSettings1" type="System.Configuration.NameValueSectionHandler"/>
<section name="customAppSettings2" type="System.Configuration.NameValueSectionHandler"/>
</configSections>
<customAppSettings1>
<add key="FirstKey" value="1" />
<add key="SecondKey" value="2" />
</customAppSettings1>
<customAppSettings2>
<add key="FirstKey" value="1" />
<add key="SecondKey" value="2" />
</customAppSettings2>
</configuration>

This code is giving changed custom values. but not saving on physical file. A bit progress in your question.
var xmlDoc = new XmlDocument();
xmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
xmlDoc.SelectSingleNode("//applicationSettings/MyApp_Application.Properties.Settings/setting/value").InnerText = "server=127.0.0.1;uid=root;pwd=root;database=" + comboBox1.SelectedItem.ToString();
xmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
ConfigurationManager.RefreshSection("applicationSettings/MyApp_Application.Properties.Settings/setting");

App.config can't find my element

I have a simple app.config file that doesn't quite pass the IDEs checker.
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="XmlRoot" type="System.String"/>
</configSections>
<connectionStrings>
<omitted/>
</connectionStrings>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
</startup>
<XmlRoot>
<add key="relativepath" value=""/>
</XmlRoot>
</configuration>
I added the <section name="XmlRoot" type="System.String" /> part to the config and then I tried to define the name and key here: <add key="relativepath" value=""/>. But for some reason the IDE gives me the following Messages:
I rarely use the app.config file so it could just be a noob mistake. How do I make it recognize my tags?

If it's just a simple string, you can use AppSettings to accomplish this.
<configuration>
<appSettings>
<add key="relativepath" value="mypath" />
</appSettings>
</configuration>
Access it from C# like this:
string path = ConfigurationManager.AppSettings["relativepath"]);

Try changing your type to System.Configuration.NameValueSectionHandler
this is how I define my sections:
<configSections>
<sectionGroup name="MySettings">
<section name="serverConfiguration" type="System.Configuration.NameValueSectionHandler"></section>
<section name="sqlSettings" type="System.Configuration.NameValueSectionHandler"></section>
</sectionGroup>
</configSections>
...
<MySettings>
<sqlSettings>
<add key="sqlTransactionTimeOut" value="0" />
</sqlSettings>
<serverConfiguration>
<add key="resolveDnsAsync" value="true" />
</serverConfiguration>
</MySettings>

Probably you need to use the section appSettings
<configuration>
<appSettings>
<!-- and Here you define the key and the value like you do-->
<add key="relativepath" value="path"/>
</appSettings>
</configuration>
then in your code write something like this to read it.
String path = ConfigurationManager.AppSettings["relativepath"].ToString();
hope it works for you.
:)

How to get contents of a .config file using ConfigurationManager.GetSection(columnsSectionName) without altering the sections' order?

In my config section I have the following:
<configuration>
<configSections>
<section name="nlog" type="NLog.Config.ConfigSectionHandler, NLog"/>
<section name="NFeColumns" type="System.Configuration.DictionarySectionHandler" />
<section name="CTeColumns" type="System.Configuration.DictionarySectionHandler" />
</configSections>
<appSettings>
<add key="csv.separator" value=";" />
<add key="infNFe.columns" value="NFeColumns"/>
<add key="infCte.columns" value="CTeColumns"/>
<add key="infNFe.filename" value=".\Extracted\NFeCollection.csv"/>
<add key="infCte.filename" value=".\Extracted\CTeCollection.csv"/>
</appSettings>
<NFeColumns>
<add key="infNFe.Id" value="Id" />
<add key="ide.cUF" value="cUF" />
<add key="dest.CNPJ" value="CNPJ" />
<add key="dest.xNome" value="xNome" />
<add key="det.nItem" value="nItem" />
<add key="prod.cProd" value="cProd" />
<add key="prod.xProd" value="xProd" />
<add key="IPI.cEnq" value="cEnq" />
</NFeColumns>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
</configuration>
I want to catch the values from and put in a IDictionary in the same order as the configuration file. I`m doing this:
string columnsSectionName = ConfigurationManager.AppSettings[colFileName + ".columns"];
IDictionary columns = (IDictionary)ConfigurationManager.GetSection(columnsSectionName);
However, Im geting the <NFeColumns> in a totally different order, and I cant figure out why. Can you please help me?

ConfigurationManager.GetSection returns an instance of HashTable. Items in a hash table won't be stored in the order they are inserted. You will have to manually order them.

Split EnterpriseLibrary Block configurations into multiple files

Is it possible to split the configuration for an enterprise library block into multiple files?
For example: I have three assemblies and one hosting project. I want to store the entlib v6 Exception Handling Application Block (EHAB) configuration for each assembly in a separate config file located in the particular assembly.
The hosting project references the three assemblies:
assembly_X
ehabX.config
assembly_Y
ehabY.config
assembly_Z
ehabZ.config
Hosting project
using ehabX.config
using ehabY.config
using ehabZ.config
I already tried the following:
App.config in the hosting project:
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="enterpriseLibrary.ConfigurationSource" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ConfigurationSourceSection, Microsoft.Practices.EnterpriseLibrary.Common" requirePermission="true" />
</configSections>
<enterpriseLibrary.ConfigurationSource>
<sources>
<add name="ehabX" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common" filePath="ExceptionHandling\ehabX.config" />
<add name="ehabY" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common" filePath="ExceptionHandling\ehabY.config" />
<add name="ehabZ" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common" filePath="ExceptionHandling\ehabZ.config" />
</sources>
<redirectSections>
<add sourceName="ehabX" name="exceptionHandling" />
<add sourceName="ehabY" name="exceptionHandling" />
<add sourceName="ehabZ" name="exceptionHandling" />
</redirectSections>
</enterpriseLibrary.ConfigurationSource>
</configuration>
ehabX.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling"/>
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="Swallow NotImplementedException">
<exceptionTypes>
<add type="System.NotImplementedException, mscorlib" postHandlingAction="None" name="NotImplementedException"/>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
</configuration>
ehabY.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling"/>
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="Swallow ArgumentException">
<exceptionTypes>
<add type="System.ArgumentException, mscorlib" postHandlingAction="None" name="NotImplementedException"/>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
</configuration>
The ehabZ.config is omitted.
Using the EHAB with the policy "Swallow NotImplementedException" works fine. But if I try to use the policy "Swallow ArgumentException" defnied in ehabY.config I get this error message:
Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionHandlingException: The policy with name 'Swallow ArgumentException' cannot be found. Exception handling aborted.
Any suggestions?

Unfortunately, there is nothing out of the box that will let you merge multiple configuration sources into one configuration set.
I think you can probably do what you want but you will have to do some coding. You'll need to read in the appropriate configuration sources and create a custom IConfigurationSource that will merge them all. Additive merge of different config sources? has an example of a MergeConfigurationSource that could help you.