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POConfigurationSettings.AppSettings is empty, throws null exception
 

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    <p>I have a class like this:</p> <pre><code>public class RxNormFolderMgr { // properties public string RxNormFolder { get { return ConfigurationSettings.AppSettings["rootFolder"].ToString(); } } } </code></pre> <p>When I try to use it like this:</p> <pre><code>public class TestRxNormFolderManager : ColumnFixture { public string RxNormFolder() { RxNormFolderMgr folderMgr = new RxNormFolderMgr(); return folderMgr.RxNormFolder; } } </code></pre> <p>I get an error: "System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object." The AllKeys property for AppSettings is an array of zero length where I am expecting length of 1.</p> <p>My app.config file in the project looks like this:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;configuration&gt; &lt;appSettings&gt; &lt;add key="rootFolder" value ="C:\RxNorm" /&gt; &lt;!-- Root folder must not end with slash. --&gt; &lt;/appSettings&gt; &lt;/configuration&gt; </code></pre> <p>I know ConfigurationSettings.AppSettings is supposed to be obsolete and I should use ConfigurationManager.AppSettings, but I can't even get that to compile. I do have a reference in the project to System.configuration (c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.configuration.dll on my machine) and using statement at top of my code.</p> <p>I am using Fitnesse to test the code, and that's when I get the error. It's my understanding that I should also place a copy of the app.config file in the Bin>Debug folder of the test fixtures project which I have done. So, I don't know why I'm getting this error still.</p> <p>Please, help.</p>
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    1. COTry using `ConfigurationManager` instead of COnfigurationSettings - does that help??
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