c# - ConfigurationManager - How to use connection strings with .NET 3.5? -

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I see a great post about what I want to do here,

This configuration manager asks to use the class. I can not reference the configuration manager class.

If I am seeing system.dll, which I am using (which is v2.0.50727), there is no configuration manager.

I am using VS 2008, and my project is set to be compiled as .NET 3.5.

If I do this, 

  string test = System.configuration.ConfigurationManager.AppSettings ["test"];

The message 'error 182' is not present in the name or name space name 'Configuration Manager' namespace 'System.configuration' (Do you have an assembly reference unavailable?) '

>

Any thoughts?

is part of the configuration manager system. Configuration Namespace By default it is not referred to in projects, so if any reference to GAC adds.


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