Problem with accessible in DotNetOpenauth?

I working on MVC project and use DotNetOpenAuth to connect with twitter, Once i declare

private static InMemoryTokenManager _tokenManager = new InMemoryTokenManager("Twitter Consumer key", "Twitter Consumer secret");

    private InMemoryTokenManager TokenManager
    {
        get
        {
            return _tokenManager;
        }
    }

then when i build it got back an error which is

Error 1 'DotNetOpenAuth.ApplicationBlock.InMemoryTokenManager' is inaccessible due to its protection level

开发者_Go百科How i set the accessible or do any setting to use it, Thank you

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InMemoryTokenManager is for samples use only. It's a bad implementation for a real app, which should be using its own ITokenManager class to store tokens in a database. That's why its inaccessible to your web site.