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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.
I know you said you would prefer a round trip, but its the only way you are going to be able to accomplish what you want.
You could put the file upload in an iframe, and do the upload behind the scenes (No page refresh, gmail does this 🙂 ) then use AJAX to download the data and insert it into the textarea.