Question : Annotate pdf file online using silverlight

I am trying to develop a pdf viewer in which user can open pdf from their local machine and annotate pdf (drawing line, rectangle, adding text, highlighting text and adding stamp) and save the pdf with annotation on their local machine. I need to do this with browser, end user can install silverlight plugin on their browser. Please help me to do this.
Any sample code and ideas will be appreciated.

Answer : Annotate pdf file online using silverlight

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