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Unable to add behaviorExtension in machine.config via c#

My BizTalk application requires me to add a custom behaviorExtension to my machine.config file. I install my application via MSI, via BizTalk Deployment Framework (BTDF), so I would like this to be done programmatically as well.
Now I cannot seem to find a way to either list installed behaviors not edit them.
I have the following code, but after that I'm stuck.
// Get the machine.config file.
Configuration machineConfig = ConfigurationManager.OpenMachineConfiguration();
// Get the machine.config file path.
ConfigurationFileMap configFile = new ConfigurationFileMap(machineConfig.FilePath);
// Map the application configuration file to the machine
// configuration file.
Configuration config = ConfigurationManager.OpenMappedMachineConfiguration(configFile);
ConfigurationSectionGroup svcModel = config.SectionGroups.Get("system.serviceModel");
ConfigurationSection extensions = svcModel.Sections.Get("extensions");
Can anyone give me some pointers on how to approach this?

You are almost there. Your extensions variable is of type System.ServiceModel.Configuration.ExtensionsSection, which has property BehaviorExtensions containing what you are looking for. So:
var extensions = (System.ServiceModel.Configuration.ExtensionsSection) svcModel.Sections.Get("extensions");
var behaviors = extensions.BehaviorExtensions;

Read settings from the configuration file of other application

The application needs to use the settings from the configuration file of another application on the same machine. Can I use the classes from the System.Configuration namespace or I should parse it as xml-file?

You can read any configuration file using the ConfigurationManager.OpenMappedExeConfiguration API.
There is a complete working example in the linked documentation.

This try:
ConfigurationFileMap fileMap = new
ConfigurationFileMap(<filename>);
Configuration managerConfiguration =
System.Configuration.ConfigurationManager.OpenMappedMachineConfiguration(fileMap);

Multiple App.Config Files in .NET Class library project

I am creating one class library project.
Now by default I have one App.Config file so that I am putting all environment specific data in that Config file.
Now based on the Environment (whether Dev / Test / Production), I am planning to have three App.Config files in VS 2010 such as
App.Dev.Config
App.Test.Config
App.Prod.Config
Wondering how would the application know which config file to use.
Anyone implemented this scenario. Any Code samples / Articles would be helpful.
Thanks

The app will use the config file named YourExcecutable.exe.config which is by default the file App.config included in your (executable) project.
Note, that .NET only loads one config file for the whole application. You cannot use multiple configuration files (i.e. one per library project) without coding.
Option: You can use postbuild events and different solution configurations to copy one or another App.Config file to the output folder
Option: You can use the ConfigurationManager Class to load an alternate config file by code.

Loading a different application configuration file at run time can be done using the concept of mapped configuration file. To start with, you need to add reference to System.Configuration.dll in your project.
Set the value of Copy to Output Directory property to Copy if newer (Refer screenshot). This has to be done only for non-default configuration files e.g. App1.config, App2.config, etc. Leave the default configuration file namely App.config as it is . Due to this change, all the non-default application configuration files will be available in the project output directory (\bin\debug) when the project is built. Default value of this property is Do not copy.
Here is the code snippet on how to read configuration data from non-default configuration files:
ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap();
configFileMap.ExeConfigFilename = "App1.config"; // app1.config should be present in root directory from where application exe is kicked off
// Get the mapped configuration file
var config = ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);
//get the relevant section from the config object
AppSettingsSection section = (AppSettingsSection)config.GetSection("appSettings");
//get key value pair
var keyValueConfigElement = section.Settings["appSettingsKey"];
var appSettingsValue = keyValueConfigElement.Value;
If you have multiple application (aka app) configuration files then you can keep a setting in default App.config file with the help of which you can make a decision at run time about which non-default configuration file to load e.g. App1.config
Note: Now look at below code:
ConfigurationManager.AppSettings["DeployEnv"]
This code will still read the data from the default App.config file. This behavior can't be changed. There is no way to prohibit the Loading of default App.config file. You have to use alternate means as discussed in this post to read the data from non-default configuration files

Now there is an even better solution: SlowCheetah - XML Transforms

Modify AppSettings in the App.Config of different Exe

I have a C# .NET Console application exe with an app.config specifying a handful of ApplicationSettings used as parameters.
I have an additional separate (Windows Forms) exe (residing in the same directory) to allow the ApplicationSettings used by the first exe to be modified by the user.
What it the cleanest way to go about modifying the first exe's app.config from the second exe?
Thanks.

you can use
public static Configuration OpenExeConfiguration(
string exePath
)
MSDN Link

Use:
Configuration cfg = ConfigurationManager.OpenExeConfiguration(path_to_exe_file_of_second_app);
// do whatever you need with that configuration
cfg.Save();
Please note that OpenExeConfiguration method takes a path to the second app exe file, not the config file itself.

Wrong App.config being loaded

I have a .NET 3.5 class library I built that reads an App.config file for values it needs. It can pull the config values just fine when I test it in Visual Studio. To test it, I just change the project to a console application and execute a method call.
I have the need to call this class library from many other .NET programs, and I want the class library to be self sufficient (I should be able to call it from any other program, and it should use its own config file, not know about any calling config file etc.).
I can add a reference to the dll (since I am still development I am using VS 2008, haven't thrown anything into the GAC yet) but the App.config that the class library is reading is from the calling program's App.config, not the class library's App.config.
The class library dll has it's config file in the same directory, so it should be able to find it just fine, and the calling application is named differently. I am using the standard key value pairs in the App.config (e.g. name of config file myClassLibrary.dll.config) and getting values out with the following line of code:
String myVal = ConfigurationSettings.AppSettings["myConfigSetting"];
Does anyone know how to fix this?

An app domain in C# can have only one assembly level app.config file. See here on MSDN. An executable will always start up an AppDomain and by default look for a config file with name: EXECUTABLE_NAME.config. For example, SampleApp01.exe will look for SampleApp01.exe.config as its configuration file.

you can place your configs in the machine.config file inside the framework folder by this way you can globally use your configuration in all .Net applications running in that machine,

I believe app.config will always be used by the executable. Just drop it in that directory.
They would do that to ensure the dll can be shared and not have to share the same .config file.
You might be able to create a link from the executable .config file
<appSettings configSource="\lib\app.config">
Or change its name, i don't understand how you can have both app.config files in the same directory..don't they have the same name?
<appSettings configSource="\lib.app.config">

I can't find a way to avoid getting the app.config for the calling dll/exe etc. The only way I have found is to use a hardcoded path and load it that way. Here is code I am using to do that:
using System.Configuration;
...
public static KeyValueConfigurationCollection getAppSettingsFromAppConfig(String appConfigPath) {
ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap();
fileMap.ExeConfigFilename = appConfigPath;
Configuration config = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
AppSettingsSection section = config.AppSettings;
KeyValueConfigurationCollection appsettings = section.Settings;
return appsettings;
}
You then have a collection of KeyValueConfigurationElement, which you can use .Value to get the string from config file with.