System.Text.Encoding.SetDefaultFallbacks C# (CSharp) Method

        internal virtual void SetDefaultFallbacks()
        {
            // For UTF-X encodings, we use a replacement fallback with an empty string,
            // For ASCII we use "?" replacement fallback, etc.
            this.encoderFallback = new InternalEncoderBestFitFallback(this);
            this.decoderFallback = new InternalDecoderBestFitFallback(this);
        }