System.Globalization.TextInfo.ChangeCaseSurrogate C# (CSharp) Method

        internal unsafe void ChangeCaseSurrogate(char highSurrogate, char lowSurrogate, out char resultHighSurrogate, out char resultLowSurrogate, bool isToUpper) {
            fixed (char* pResultChar1 = &resultHighSurrogate, pResultChar2 = &resultLowSurrogate) {
                nativeChangeCaseSurrogate(m_pNativeTextInfo, highSurrogate, lowSurrogate, pResultChar1, pResultChar2, isToUpper);
            }
        }