The name ‘ConfigurationManager’ does not exist in the current context

by

It’s not only necessary to use the namespace System.Configuration. You have also to add the reference to the assembly System.Configuration.dll , by

  1. Right-click on the References / Dependencies
  2. Choose Add Reference
  3. Find and add System.Configuration.

This will work for sure.
Also for the NameValueCollection you have to write:

using System.Collections.Specialized;

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