System.Text.EncoderFallbackException.EncoderFallbackException C# (CSharp) Method

        internal EncoderFallbackException(
            String message, char charUnknownHigh, char charUnknownLow, int index) : base(message)
        {
            if (!Char.IsHighSurrogate(charUnknownHigh))
            {
                throw new ArgumentOutOfRangeException("charUnknownHigh",
                    Environment.GetResourceString("ArgumentOutOfRange_Range",
                    0xD800, 0xDBFF));
            }
            if (!Char.IsLowSurrogate(charUnknownLow))
            {
                throw new ArgumentOutOfRangeException("CharUnknownLow",
                    Environment.GetResourceString("ArgumentOutOfRange_Range",
                    0xDC00, 0xDFFF));
            }

            this.charUnknownHigh = charUnknownHigh;
            this.charUnknownLow = charUnknownLow;
            this.index = index;
        }