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Help with System.Configuration Namespace

Here's the scenario:

We have a web app and I would like to store application configuration info (such as caching flags, db connection string, etc) in an xml configuration file.  We the app loads (Application_onStart event), read the config and set it in my config class.

I believe there is some way to read the config file using the System.Configuration namespace, cast it to a NameValueCollection type so that I can traverse through the xml looking for my config elements.  However, I can't get the config file to be read.

Does anyone have any ideas or links for me?  I've scoured MSDN, examined a Duwamish sample that uses this method, google my arse off but I am still at square one.

Any help would be really appreciated.  I am a lone developer so I have no one to bounce these types of ideas off of.

Wednesday, November 12, 2003

"We the app loads" should read "When the app loads".  Oops;)

Wednesday, November 12, 2003

System.Configuration is used to read the application configuration file. For executables, that's appname.exe.config; for web applications, that's web.config.

If you want to read an arbitrary XML file, you should use the XML APIs.

Brad Wilson (
Wednesday, November 12, 2003

You can store settings in web.config
        <add key="key" value="value">
In code use something like this to read the values.

using System.Configuration;
  string value = ConfigurationSettings.AppSettings["key"];

See: and

If reading from a custom file use something like:

string myConfigFile = HttpContext.Current.Server.MapPath("~/MyCustomConfig.xml");
string value = anXmlDocument.SelectSingleNode("/Config/Setting[@Key='ConnectionString']/@Value").Value;

Duncan Smart
Wednesday, November 12, 2003

If you're a lone developer then you'd better get used to using the resources that are just a few mouse clicks away too:

All this stuff is on your hard drive too in the .NET Framework SDK Documentation.

Duncan Smart
Wednesday, November 12, 2003

Thanks all.  I had the code correct except I was calling my config file app.config not web.config.

Wednesday, November 12, 2003

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