[2005] cant show text in richtextbox

[hallongodis]

hello!
I've been trying to get this into a textbox but it don't seem to work. Prehaps you have a explanation.

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(note a key dont get into this box and i belive it is a chr(0) )

and dont say "use richtextbox.loadfile(file) becouse i have already tried that. And a streamreader.
i have tried to get rid of the chr(0) many times too.
And when i update my richtextbox very fast i seem to get more letters into it.