Recaptcha ErrorMessage

I'm using the Recaptcha control in asp.net web forms. And i've faced with the problem about ErrorMessage. How to:

• Set E开发者_StackOverflowrrorMessage for it?
• Show (hide) the ErrorMessage if the Recaptcha is (isn't) valid?

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If you grab the latest source code you should find examples in dotnet/test folder.

ErrorMessage can be set through CustomTranslations property like here: recaptcha-plugins/dotnet/test/CustomTranslation.aspx.cs

    protected void Page_Init(object sender, EventArgs e)
    {

        var customTranslation = new Dictionary<string, string>();
        customTranslation.Add("instructions_visual", "Scrivi le due parole:");
        customTranslation.Add("incorrect_try_again", "Scorretto. Riprova.");

        RecaptchaControl.CustomTranslations = customTranslation;

    }

The ErrorMessage will be automatically displayed in a ValidationSummary because RecaptchaControl implements IValidator interface.