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.

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