How to display confirm modal dialog box in the middle of a process in ASP.NET MVC

I read a csv file into a datable and loop through that datable. If a particular row inside that datatable contains invalid data, then I want to show a pop-up confirm message box telling "Are you sure you want to proceed?" If yes, then remaining looping in datatable will continue. Otherwise, I want to exit from the loop. How to accomplish this in asp.net mvc?

Thanks
lastbattleAsked:
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NazoUKCommented:
You won't be able to do it quite as you describe.  You'll have to check the csv file for errors first and if it contains any then return a view that prompts for confirmation to continue.

You can't interrupt the server processing with a client prompt.
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