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The RadCaptcha provides a mechanism for quick and easy localization based on the native ASP.NET localization. The ErrorMessage, the Label telling the user to enter the code and the button labels are obtained from the resource files located in the App_LocalReources directory, so that the language of the RadCaptcha is automatically switched to the culture and UI culture of the Web page.

You can inspect these files by navigating to your Telerik® UI for ASP.NET AJAX installation folder, then under Live Demos locate the Captcha\Examples\Localization directory as it also contains example audio codes.

Each of the localization strings can also be modified at runtime using the respective server-side properties: ErrorMessage, CaptchaTextBoxLabel, CaptchaAudioLinkButtonText, and CaptchaLinkButtonText. This eliminates the need to create a new localization file to change a single string. For example:

RadCaptcha1.ErrorMessage = "Incorrect code";
RadCaptcha1.CaptchaTextBoxLabel = "Enter the code from the image";
RadCaptcha1.CaptchaAudioLinkButtonText = "Play the audio code";
RadCaptcha1.CaptchaLinkButtonText = "Generate a new image";
RadCaptcha1.ErrorMessage = "Incorrect code"
RadCaptcha1.CaptchaTextBoxLabel = "Enter the code from the image"
RadCaptcha1.CaptchaAudioLinkButtonText = "Play the audio code"
RadCaptcha1.CaptchaLinkButtonText = "Generate a new image"
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