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As I learned so far, client-side AJAX script can read a static .json or .xml file from server.

But I need to generate a .json or .xml file dynamically according to the user input at client-side. e.g. imagine that the user selects a state from DropDownList1 and AJAX should fill DropDownList2 with that state's cities; while I don't like to send all cities and then filtering desired cities in client-side!

So, I would like to know how ASP.NET can handle this e.g. when it sees "http://www.mydomain.com/cities.json?state=9" then it should response with a dynamically created json file named cities.json which contains the cities which are in state #9?

Thanks in advance!

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closed as off topic by ChrisF May 8 '12 at 10:50

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This would be better asked on Stack Overflow, but I think you'd need to show more research and include more details for it to get a decent answer there. –  ChrisF May 8 '12 at 10:51

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