System.util.Properties.LoadConvert C# (CSharp) Method

        private String LoadConvert(String theString)
        {
            char aChar;
            int len = theString.Length;
            StringBuilder outBuffer = new StringBuilder(len);

            for (int x=0; x<len; ) {
                aChar = theString[x++];
                if (aChar == '\\') {
                    aChar = theString[x++];
                    if (aChar == 'u') {
                        // Read the xxxx
                        int value=0;
                        for (int i=0; i<4; i++) {
                            aChar = theString[x++];
                            switch (aChar) {
                                case '0': case '1': case '2': case '3': case '4':
                                case '5': case '6': case '7': case '8': case '9':
                                    value = (value << 4) + aChar - '0';
                                    break;
                                case 'a': case 'b': case 'c':
                                case 'd': case 'e': case 'f':
                                    value = (value << 4) + 10 + aChar - 'a';
                                    break;
                                case 'A': case 'B': case 'C':
                                case 'D': case 'E': case 'F':
                                    value = (value << 4) + 10 + aChar - 'A';
                                    break;
                                default:
                                    throw new ArgumentException(
                                        "Malformed \\uxxxx encoding.");
                            }
                        }
                        outBuffer.Append((char)value);
                    } else {
                        if (aChar == 't') aChar = '\t';
                        else if (aChar == 'r') aChar = '\r';
                        else if (aChar == 'n') aChar = '\n';
                        else if (aChar == 'f') aChar = '\f';
                        outBuffer.Append(aChar);
                    }
                } else
                    outBuffer.Append(aChar);
            }
            return outBuffer.ToString();
        }