Read & display text file in javascript

The user needs to click on browse button to browse his system .He then selects a text file & clicks ok.Once he clicks ok all the data in the text file should be displayed in a text area.How do I do that? I am using JavaScript & c# designing aspx pages.It would be preferable if i avoid round trip to the server.
How can I do it with IFrames then?Some thing on the side lines of gmail attachment

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