I am developing a simple class library project, which will give me a dll.
I wanted a particular value to be read from a config file. So I have added an App.config file to my project.
<?xml version="1.0" encoding="utf-8" ?>
<add key="serviceUrl" value="test value" />
string strVal = System.Configuration.ConfigurationManager.AppSettings["serviceUrl"];
As stated in my comment, add the App.Config file to the main solution and not in the class library project.