Hi govindrajan,
Not quite understand your question, I would like to clarify something with you:
1, Are you working with C# WebView or WinJS? If you are working with WinJS, I will move the thread to WinJS forum.
2, What do you mean by external JQuery? If you need reference JQuery in your WinJS project, simply download it to local and ref to it. For more information you can ref to the blog:
http://blogs.windows.com/buildingapps/2013/07/10/jquery-and-winjs-working-together-in-windows-store-apps/
--James
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