App config in Class library C#

Question

I have a wpf application which is using a dll of a class library. I am unable to access the app.config value in the class library

How I'm trying to access app.config:

ConfigurationSettings.AppSettings["conStr"].ToString();

this is returning a null value using System.Configuration is also added .

Answer 1

Why don't you just put that value in the Main Project ?

If you're calling the class library from the Main Project. Then the code in the class library uses the AppConfig defined inside the main project.

It is a common practice to have the connection string in the AppConfig for the Main Project and not inside the Class Library.