coloring in the rich text box in C#

How, I can achieve this functionality when I write down something in rich text box and press space or enter key and then if i开发者_Go百科t is a keyword( Void, main,if, else etc) then it should be in blue color. Means only thats word which is key word. I have been made the functionality to achieved the word which i am typing but not able to set the blue color.

Thanks in advance.

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Maybe simply switch to Scintilla.Net and set the lexer to the language you like (or write your own lexer)?