RichTextBox Find the text and Highlight all text

Hi

I am using RIchTextBox and i am done with find option for it. When find is pressed it shows  only first find result .. i want it to Highlight all the text which are with that find text in the RICHTEXTBOX.. how this can be done?????? and i want to use Next in with that also any link or example????

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Thanks Avinash Desai