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How can I add a HttpModule in ApplicationHost.config for all websites on IIS Server from C#?

I am trying something like
public string[] RegisterInApplicationConfig()
{
using (ServerManager serverManager = new ServerManager())
{
Configuration config = serverManager.GetApplicationHostConfiguration();
var section = config.GetSection("location/system.webServer/modules");
}
}
but error I am getting is -
The configuration section location/system.webServer/modules cannot be read because it is missing a section declaration.
I am referring post from to add HttpModule -
How do I register a HttpModule in the machine.config for IIS 7?
So Basically in ApplicationHostConfig I need to get to
<location path="" overrideMode="Allow">
<system.webServer>
<modules>
<add name="IsapiFilterModule" lockItem="true" />

So I found the solution after some hit & trials. Might help someone in future-
I needed to do GetCollection on "system.webServer/modules" section
Configuration config = serverManager.GetApplicationHostConfiguration();
var section = config.GetSection("system.webServer/modules", "");
var collection = section.GetCollection();
var element = collection.CreateElement();
element.Attributes["name"].Value = "MyHttpModule";
element.Attributes["type"].Value = MyHttpModule.XXXModule, MyHttpModule, Version=1.0.0.0, Culture=neutral, PublicKeyToken=bc88fbd2dc8888795";
collection.Add(element);
serverManager.CommitChanges();

unable to Read the config file data from local drive

I fail to read the appSettings from a config file. It is not located in the default location so when I tried using var aWSAccessKey = ConfigurationManager.AppSettings["AWSAccessKey"]; it didn't work.
Config file:
<appSettings>
<add key="AWSAccessKey" value="1" />
<add key="AWSSecretKey" value="2" />
<add key="AWSRegion" value="4" />
<add key="AWSAccountNumber" value="5" />
</appSettings>
Also tried with no success:
var fileMap = new ConfigurationFileMap("D:AWS\\CoreLocalSettings.config");
var configuration = ConfigurationManager.OpenMappedMachineConfiguration(fileMap);
var sectionGroup = configuration.GetSectionGroup("applicationSettings");

Finally it's working:
In the app.config file I read the outside config file data as below
<configuration>
<appSettings file="D:\AWS\CoreLocalSettings.config">
.......
</appSettings>
</configuration>
In the code base I am accessing same using the ConfigurationManager
var strAWSAccessKey = ConfigurationManager.AppSettings["AWSAccessKey"];

var web = System.Web.Configuration.WebConfigurationManager
.OpenWebConfiguration(#"D:\Employee\Hitesh\Projects\Web.config");
var appValue = web.AppSettings.Settings["SMTPServerPort"].Value;

var AWSAccessKey = ConfigurationManager.AppSettings["AWSAccessKey"];

Write appSettings in external file

I have a config file app.exe.config and appSettings section has something like this:
<configuration>
<appSettings configSource="app.file.config" />
</configuration>
app.file.config file has something like this:
<?xml version="1.0" encoding="utf-8" ?>
<appSettings>
<add key="var1" value="value 1" />
<add key="var2" value="value 2" />
<add key="var3" value="value 3" />
</appSettings>
I need to edit var1, var2 and var3 at runtime and I have code like this:
Configuration config = ConfigurationManager.OpenExeConfiguration("...path\app.exe);
config.AppSettings.SectionInformation.ConfigSource = "app.file.config";
config.AppSettings.Settings["var1"].Value = "value 11";
config.AppSettings.Settings["var2"].Value = "value 22";
config.AppSettings.Settings["var3"].Value = "value 33";
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");
When I run config.Save.... the file app.file.config has a appSettings node with an attribute "file". This attribute has the value to app.file.config
<appSettings file="app.file.config">
<add key="var1" value="value 1" />
<add key="var2" value="value 2" />
<add key="var3" value="value 3" />
</appSettings>
Now, if I try to load the config file, I have an exception with message "Unrecognized attribute 'file'. Note that attribute names are case-sensitive." in app.file.config.
If I delete the file attribute manually, the configuration file is loaded properly.
Any ideas?
How can avoid to write file attribute when I save config files.
Thanks

using an external config file is transparent for the application,
this part is o.k
</configuration>
<appSettings configSource="app.file.config" />
</configuration>
and also this:
<?xml version="1.0" encoding="utf-8" ?>
<appSettings>
<add key="var1" value="value 1" />
<add key="var2" value="value 2" />
<add key="var3" value="value 3" />
</appSettings>
change your code to be like this:
Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
config.AppSettings.Settings["var1"].Value = "value 11";
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");
referring an external configuration file is transparent to the application,
so you don't have to call it directly. you can use the default appSetting section in the configuration manager.
Good luck

A more complete answer to prevent confusion:
Setup:
Commandline project called 'app'
app.exe.config file, App.config:
<appSettings file="App.Settings.config"></appSettings>
App.Settings.config file with 'Copy to Output Directory'= 'Copy Always'
<?xml version="1.0" encoding="utf-8"?>
<appSettings>
<add key="test" value="OVERRIDDEN"/>
</appSettings>
Program.cs:
static void Main(string[] args)
{
try
{
Console.WriteLine("Local Config sections");
var exepath = (new Uri(System.Reflection.Assembly.GetExecutingAssembly().CodeBase)).LocalPath;
Configuration config = ConfigurationManager.OpenExeConfiguration(exepath);
config.AppSettings.SectionInformation.ConfigSource = "App.Settings.config";
Console.WriteLine("BEFORE[test]=" + config.AppSettings.Settings["test"].Value);
Console.WriteLine($"BEFORE[testExternalOnly]={config.AppSettings.Settings["testExternalOnly"]?.Value}");
//to avoid: Error CS0266
//Explicitly cast 'System.Configuration.AppSettingsSection'
AppSettingsSection myAppSettings = (AppSettingsSection)config.GetSection("appSettings");
myAppSettings.Settings["test"].Value = "NEW";
if (!myAppSettings.Settings.AllKeys.Contains("testExternalOnly"))
myAppSettings.Settings.Add("testExternalOnly", "NEWEXTERNAL");
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");
//Read updated config
Console.WriteLine("AFTER[test]=" + config.AppSettings.Settings["test"].Value);
Console.WriteLine("AFTER[testExternalOnly]=" + config.AppSettings.Settings["testExternalOnly"].Value);
Console.WriteLine("AFTER CONFIG EXTERNAL FILE: " + System.IO.File.ReadAllText("App.Settings.config"));
Console.WriteLine("AFTER CONFIG FILE: " + System.IO.File.ReadAllText(System.AppDomain.CurrentDomain.FriendlyName + ".config"));
//Shut current config
config = null;
//Open config
config = ConfigurationManager.OpenExeConfiguration(exepath);
config.AppSettings.SectionInformation.ConfigSource = "App.Settings.config";
Console.WriteLine("AFTER[test]=" + config.AppSettings.Settings["test"].Value);
Console.WriteLine("AFTER[testExternalOnly]=" + config.AppSettings.Settings["testExternalOnly"].Value);
Console.WriteLine("AFTER CONFIG EXTERNAL FILE: " + System.IO.File.ReadAllText("App.Settings.config"));
Console.WriteLine("AFTER CONFIG FILE: " + System.IO.File.ReadAllText(System.AppDomain.CurrentDomain.FriendlyName + ".config"));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.WriteLine("press the ENTER key to end");
Console.ReadLine();
}
This will result in App.Settings.config file updated to be on the filesystem as:
<?xml version="1.0" encoding="utf-8"?>
<appSettings>
<add key="test" value="NEW" />
<add key="testExternalOnly" value="NEWEXTERNAL" />
</appSettings>

Finally, I have found a solution.
The solution is to declare the config file as this:
<appSettings configSource="app.file.config">
<add key="var1" value="value 1" />
<add key="var2" value="value 2" />
<add key="var3" value="value 3" />
</appSettings>
And from code
Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
AppSettingsSection myAppSettings = config.GetSection("appSettings")
myAppSettings.Settings["var1"].Value = "value 11";
config.Save(ConfigurationSaveMode.Modified);
Note that I use
GetSection("appSettings")
instead of
config.AppSettings.Settings
Thanks to all that help people in StackOverflow.

NHibernate. SessionFactory.Delete deletes all tables

I try to run example from https://github.com/jagregory/fluent-nhibernate/wiki/Getting-started but after running next code all tables are cleared. I don't understand why it happens. I expecting that the store var barginBasin = new Store { Name = "Bargin Basin" }; and rows from table StoreProduct with Store_id of this store will be deleted.
using (var session = sessionFactory.OpenSession())
{
session.Delete(session.CreateCriteria(typeof (Store)).List<Store>()[0]);
session.Flush();
}
sessionFactory initialization:
var dbConfig = OracleDataClientConfiguration.Oracle10
.ConnectionString(c => c.FromConnectionStringWithKey("Oracle"))
.Driver<OracleDataClientDriver>()
.ShowSql();
sessionFactory = Fluently.Configure()
.Database(dbConfig)
.Mappings(m => m.FluentMappings.AddFromAssemblyOf<Employee>())
.BuildSessionFactory();
App.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<connectionStrings>
<add name="Oracle"
connectionString="DATA SOURCE=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=[IP])(PORT=[PORT]))(CONNECT_DATA=(SERVICE_NAME=XE)));PASSWORD=[PASSWORD];PERSIST SECURITY INFO=True;USER ID=[USER ID]"
providerName="Oracle.DataAccess.Client" />
</connectionStrings>
</configuration>

Custom Config section in App.config C#

I'm a quite beginner with config sections in c#
I want to create a custom section in config file. What I've tried after googling is as the follows
Config file:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="MyCustomSections">
<section name="CustomSection" type="CustomSectionTest.CustomSection,CustomSection"/>
</sectionGroup>
</configSections>
<MyCustomSections>
<CustomSection key="Default"/>
</MyCustomSections>
</configuration>
CustomSection.cs
namespace CustomSectionTest
{
public class CustomSection : ConfigurationSection
{
[ConfigurationProperty("key", DefaultValue="Default", IsRequired = true)]
[StringValidator(InvalidCharacters = "~!##$%^&*()[]{}/;'\"|\\", MinLength = 1, MaxLength = 60)]
public String Key
{
get { return this["key"].ToString(); }
set { this["key"] = value; }
}
}
}
When I use this code to retrieve Section I get an error saying configuration error.
var cf = (CustomSection)System.Configuration.ConfigurationManager.GetSection("CustomSection");
What am I missing?
Thanks.
Edit
What I need ultimately is
<CustomConfigSettings>
<Setting id="1">
<add key="Name" value="N"/>
<add key="Type" value="D"/>
</Setting>
<Setting id="2">
<add key="Name" value="O"/>
<add key="Type" value="E"/>
</Setting>
<Setting id="3">
<add key="Name" value="P"/>
<add key="Type" value="F"/>
</Setting>
</CustomConfigSettings>

App.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="customAppSettingsGroup">
<section name="customAppSettings" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</sectionGroup>
</configSections>
<customAppSettingsGroup>
<customAppSettings>
<add key="KeyOne" value="ValueOne"/>
<add key="KeyTwo" value="ValueTwo"/>
</customAppSettings>
</customAppSettingsGroup>
</configuration>
Usage:
NameValueCollection settings =
ConfigurationManager.GetSection("customAppSettingsGroup/customAppSettings")
as System.Collections.Specialized.NameValueCollection;
if (settings != null)
{
foreach (string key in settings.AllKeys)
{
Response.Write(key + ": " + settings[key] + "<br />");
}
}

Try using:
var cf = (CustomSection)System.Configuration.ConfigurationManager.GetSection("MyCustomSections/CustomSection");
You need both the name of the section group and the custom section.

Highlight ConfigurationSection press F1,
You will see that the implementation on the MSDN website overrides a property called "Properties" which returns a "ConfigurationPropertyCollection", as your properties have a matching attribute of that type you should be able to populate this collection with your properties if not wrap them in the same way the MS guys have.