Fixing Obsolete System.Configuration.ConfigurationSettings.AppSettings in C#

Okay this is a quick one. If you’re having “‘System.Configuration.ConfigurationSettings.AppSettings’ is obsolete: ‘This method is obsolete, it has been replaced by System.Configuration!System.Configuration.ConfigurationManager.AppSettings’” as error message when working with C#, then you have come to the right place for the fix. Here we go then.

To fix it, just add a reference to “System.Configuration.dll“. And change from “ConfigurationSettings.AppSettings” to “ConfigurationManager.AppSettings“. (C# code example below)

Now if you have no idea what this gibberish above means, here is an in detail explanation. Non-noobs, please read no more. Noobs, follow the steps.

1. Right-click on your project, look for Add Reference and click on it
2. Choose the .Net tab and search for System.Configuration on the list
3. Click on OK
4. Now that the reference is added, just replace ConfigurationSettings.AppSettings withConfigurationManager.AppSettings in your code. (C# code example below)

So if your code was like:

Console.WriteLine(ConfigurationSettings.AppSettings.Get("anyKey"));

It should now be like:

Console.WriteLine(ConfigurationManager.AppSettings.Get("anyKey"));

Now that this is fixed, you can get back to work on your project. It is an easy fix as you can see, but it’s not intuitive. I had to find the fix on aspcode.net. Hope this helps some of you out.

http://www.technoreply.com/fixing-obsolete-configurationsettings-appsettings-in-c-sharp/