What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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.