How to export excel from Web method in asp.net

First you need to send an AJAX request to server  which will get data and write the data stream. Follow below link that will help you:

 

http://stackoverflow.com/questions/12086999/download-file-from-c-sharp-through-web-method-via-ajax-call 

 

http://stackoverflow.com/questions/12601180/how-to-download-file-via-jquery-ajax-and-c-sharp

 

http://codepedia.info/jquery-ajax-json-example-asp-net-sql-database/ 

 

Note: For security reasons, you shouldn't download files from client side. Try it using postback event.