Reference to ConfigurationManager class generates compile errors in .net 4.5

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I'm using this namespace:

using System.Configuration;

and here is my code:

private static string _smtpServer = ConfigurationManager.AppSettings["SMTPServer"];

However I am getting a compilation error saying that "ConfigurationManager" does not exist.

Thanks

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Everyone, even non-registered users could send Bitcoin Tips to YOU if they are inspired by your answer!

Including "using" statement is not enough. In order for compiler to find your target class (ConfigurationManager), you need to REFERENCE the assembly that contains that class definition. In your case, this assembly is known as "System.Configuration".

To add a reference to the above mentioned assembly:

  1. Right click on your project;
  2. Click to "Add Reference";
  3. Select the .NET Tab;
  4. Select System.Configuration

This should make it work. Cheers!

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