private static void ColorizeCode(RichTextBox rtb)        {            string[] keywords = {"as", "do", "if", "in", "is", "for", "int", "new", "out", "ref", "try", "base",                                "bool", "byte", "case", "char", "else", "enum", "goto", "lock", "long", "null",                                "this", "true", "uint", "void", "break", "catch", "class", "const", "event", "false",                                "fixed", "float", "sbyte", "short", "throw", "ulong", "using", "where", "while",                                "yield", "double", "extern", "object", "params", "public", "return", "sealed",                                "sizeof", "static", "string", "struct", "switch", "typeof", "unsafe", "ushort",                                "checked", "decimal", "default", "finally", "foreach", "partial", "private",                                "virtual", "abstract", "continue", "delegate", "explicit", "implicit", "internal",                                "operator", "override", "readonly", "volatile",                                "interface", "namespace", "protected", "unchecked",                                "stackalloc",                                "from", "in", "where", "select", "join", "equals", "let", "on", "group", "by",                                "into", "orderby", "ascending", "descending", "var"};            string text = rtb.Text;            rtb.SelectAll();            rtb.SelectionColor = rtb.ForeColor;            foreach (String keyword in keywords)            {                int keywordPos = rtb.Find(keyword, RichTextBoxFinds.MatchCase | RichTextBoxFinds.WholeWord);                while (keywordPos != -1)                {                    int commentPos = text.LastIndexOf("//", keywordPos, StringComparison.OrdinalIgnoreCase);                    int newLinePos = text.LastIndexOf("\n", keywordPos, StringComparison.OrdinalIgnoreCase);                    int quoteCount = 0;                    int quotePos = text.IndexOf("\"", newLinePos + 1, keywordPos - newLinePos, StringComparison.OrdinalIgnoreCase);                    while (quotePos != -1)                    {                        quoteCount++;                        quotePos = text.IndexOf("\"", quotePos + 1, keywordPos - (quotePos + 1), StringComparison.OrdinalIgnoreCase);                    }                    if (newLinePos >= commentPos && quoteCount % 2 == 0)                        rtb.SelectionColor = Color.Blue;                    keywordPos = rtb.Find(keyword, keywordPos + rtb.SelectionLength, RichTextBoxFinds.MatchCase | RichTextBoxFinds.WholeWord);                }            }            rtb.Select(0, 0);        }