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Accessing App.Config Values In Class Library Not Working In C#

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In a project that we are working with involves several class libraries. And one of them involves setting/getting the connection string. We simply added an application config file with the connection string in it. However, accessing the key/value of connection string returns null.

One possible solution is to add a Settings file in the class library where you can set the connection string. And to access the connection string value, refer to the code below:
//Settings is the Settings File.  
 //SalesConnection is the Name of the connection string  
  return new Settings().SalesConnection;
Here's a similar post regarding Settings File:
Setting app.config in ASP.NET
Cheers!

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