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You can check the following guides, that will help you on how to fetch the post data sent by your form:
You can also easily get the PHP variables by following this guide: http://www.jotform.com/help/51-How-to-Post-Submission-Data-to-Thank-You-Page. You can take note of them and use them in your PHP file.
I hope that helps.
If you face any issue, or need further assistance, feel free to revert back.
Actually i have asp.net application but can't get post data through Request.QueryString["firstname"]
I'm not sure you can do that directly. I can suggest you to check Webhooks that you can use to send HTTP Post data to URL. On the other hand, if you want to export your form submissions data into an SQL script so you can easily import it into your SQL Server and automatically create a table for you, use this app: http://sqlserver.jotform.io/
Hope it helps.
If I find out something more I will get back to you.
Late to the party, but for asp.net the payload looks something like the following, according to requestBin.
webhookURL //i think this is only present if you are using a webhook integration though.
so something like Request.Form["rawRequest"] will give u the json string representation of what the answers were for the submitted form.