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How to read and write custom sections in app.config?

I want to read and write the users settings in the app.config file of my project.
I want to add the user name as a section and adding its setting, for each user if he is not exist in the app.config.
And I want to read it at the beginning of the application.
Can you help me please?

.Net already has this class ConfigurationManager you can use to read app.config and web.config for web scenarios. You could use something like this
var temp = ConfigurationManager.AppSettings["data"];
for more info please check the MSDN ConfigurationManager

How to read a web.config from .Net Window Application

I'm developing a .NET Framework 4.0 based Windows application.
I have a requirement of distributing this window application, along with source code to client.
When I test I'm using my own database credentials.
So I want a method to somehow hide the app.config details.
For this, I tried with encrypting values in app.config but faced an issue with token keys.
While researching about it, I found that I can use:
System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration.
But that again required username and password for accessing remote server and don't want to show them to the client.
So for this I planned to read web.config hosted on IIS 7.5 Server.
Could you please help me in that context?
Or if you have better ideas to achieve the objective, do share.

The code is designed to be very close in syntax to the usual method used for accessing web.config from a web app. Pass the constructor the location of the web.config file you wish to parse and then use the AppSettings method to obtain the desired value;
string filename = #"c:\temp\Web.Config";
UK.Org.Webman.ConfigurationSettings ConfigurationSettings =
new UK.Org.Webman.ConfigurationSettings(filename);
string PrimaryDatabase = ConfigurationSettings.AppSettings["PrimaryDatabase"];

Using configurationmanager to read from multiple web.config files

Background:
I have some data thats stored in the web.config files of about 100 web applications. This data is getting moved to a database gradually. The webpages will show the web.config data until somebody clicks on an "edit" link in which case they'll be redirected to a webpage which will allow them to update this data where it will be saved in a database instead.
Problem:
Not all of the data will be changed on this page that will save it to the database. When somebody clicks the "edit" link I want the form to populate with the data from the web.config file and when they click "save" have it save to the database. However, using the configurationmanager I can only get it to pull data from the web.config file on current application.
Questions:
Is there a way to use configurationmanager to select the web.config file from lets say ../{dynamic_app_id}/web.config ?
is reading them as plain xml files my only option?
Are there any pitfalls to this approach?
Is there another solution that would work better perhaps?

You can read any config file with ease. Please see my sample code where I read application settings from external app.config file:
System.Configuration.KeyValueConfigurationCollection settings;
System.Configuration.Configuration config;
System.Configuration.ExeConfigurationFileMap configFile = new System.Configuration.ExeConfigurationFileMap();
configFile.ExeConfigFilename = "my_file.config";
config = System.Configuration.ConfigurationManager.OpenMappedExeConfiguration(configFile, System.Configuration.ConfigurationUserLevel.None);
settings = config.AppSettings.Settings;
Happy coding and best regards!

You can add below section in your web.config
then, add "env" folder in your project and add your environmental settings into EnvironmentalSettings.config. And you can still use ConfigurationManager to get settings from EnvironmentalSettings file.
Does that answer your question?

Access IIS Websites Properties Using ServerManager

I am able to display the sites in my IIS using the serverManager.Site. Is there any way to list the files in each of the Website. I need to change RequireSSL property of one of the File. Is that Possible using ServerManager? Or any other way to do the same like appcmd ? Any Help is appreciated.

I found a Solution in the link provided by Antonio in the comment. Basically we can change the ApplicationHost Config File to get it done. Heres the link again
Configure SSL on a Microsoft.Web.Administration.Application object?

configuration settings in asp.net

We have a static html/webform site, the site lacks search functionality, I was able to get yahoo BOSS (Build your Own Search Service) after a few hours yesterday, i got it working (still working on adding missing features like pagination) , I was wondering about the configuration options of the class, as I have a BossSearch.cs in App_Code, with some fields that are set at the top:
public class BossSearch
{
String sResultsPage = "~/searchResults.aspx";
String sSearchString="";
String sApiKey = ConfigurationSettings.AppSettings["BossApiKey"];
String sSite = "www.oursite.com"; //without http://
String sQuery = "http://boss.yahooapis.com/ysearch/web/v1/{0}%20+site:{1}?appid={2}&format=xml&start={3}&count={4}";
String sStart = "0";
Uri address;
WebProxy webproxy = new WebProxy("http://192.168.4.8:8080");
bool bUseProxy = true;
int nResultsPerPage = 10;
int nTotalResults = 0;
...
As you can see, i get the BossApiKey from the web.config file, but all others I have them in the declared in the class, should I put all of them in the web.config file? if I'm thinking of reusing the class (should i say class library?) in other websites as well? can I turn it into a dll and what would the advantages be? i read somewhere that a dll has its own config file, is this the way to store those settings?
Apologies for my ignorance, since I'm not that familiar with developing applications (still studying)

What you read about .NET assemblies having their own config files is not absolutely correct; a web site has web.config files, one in the root and zero/one in each subdirectory. If a .NET assembly that is in the application calls into the standard config API, it will get its data from that web.config.
The same goes for WinForms apps and the [appname].exe.config file; any assemblies included that use the standard config API will be getting their data from that.
All of that is not to say that any assembly could not define its own configuration mechanism which pulls its data from wherever it wants.
And yes; if you intend to reuse this code a good bit, you are thinking along the right lines; put the code in its own assembly, and have it get its data from Config files so you do not need to recompile it for each application.

If you declare all of them in a database or web.config, you don't need to recompile each time you reconfigure the search engine

I you're striving for reuse and ease of use, then I would recommend writing a custom configuration section for your control. This can be part of the dll you distribute to other application and will allow you to have the ultimate in flexibility and explicit portability to other .net apps.
Enjoy!

You should only store the value in a single place in your application. For an ASP.NET application, the web.config file is an appropriate place for these kind of things. You won't need to recompile your application if this value changes.
If you decide to put your code into a separate class library and still want to use a config file to store your api key, you should note that your appSetting key needs to be entered in the application or web site's config file - you can't define a config file for a class library.
One other approach that you might find useful would be to make a wrapper class to store your settings. You could have class with static methods to look up your appSettings key so that you get a nice, compile time, way to get the api key, rather than typing out the name of your appSettings key everywhere.