How does prouct exports works in admin area

I have created a new module to view the messages sent to the admin.so when i click on user-request button on the admin able to list all messages sent by users(i added functionality to save the messages in database).but i am not able to download the messages through exel. so can any one please explain me how does the export functionality works

Look at the code in \Libraries\Nop.Services\ExportImport

Thank you for your reply sir,
But i am not understainding from wher these actions are called when i clicking on export.
(for example plase explain me from where ExportOrdersToXml() is calling while clicking Export to xml)

rakshiraik1 wrote:
Hi.
ExportXmlAll ---> Presentation\Nop.Web\Administration\Controllers\OrderController.cs(1270):
ExportXmlSelected ---> Presentation\Nop.Web\Administration\Controllers\OrderController.cs(1300):
Best Regards.

Thank u sir for reply ,actually i got these two functions actually what i need is the which fuction immediately calls when i click on export button on top.

Clicking the button itself does nothing.  The dropdown right next to it has the options.  E.g.

   <button type="submit" name="exportexcel-all">

Note the type="submit".  This will submit the Form to the Controller:

        [HttpPost, ActionName("List")]
        [FormValueRequired("exportxml-all")]
        public ActionResult ExportXmlAll(OrderListModel model)

Thank you sir,

I have created a messagelist action(with view to list all messages sent to the vender) in the same order controller which has already a list(list all orders) action exists.both view have the export button pointing to same action.so how can i write different action to create exproted files(message list) and call it from export dropdown(<button type="submit" name="exportxml-all"> how to menstion specific action to be called in this button).

Thank you sir,

I have created a messagelist action(with view to list all messages sent to the vender) in the same order controller which has already a list(list all orders) action exists.both view have the export button pointing to same action.so how can i write different action to create exproted files(message list) and call it from export dropdown(<button type="submit" name="exportxml-all"> how to menstion specific action to be called in this button).