Cross-page posting means that you are posting form data to another page as opposed to posting form data back to the same page.
When we snap submit get on a site page, the page shows the data in the understanding. The method where we present the data on different pages is called Cross Page posting. This can be cultivated by setting POSTBACKURL property of the catch that causes the postback. The mind control method for PreviousPage can be used to get the posted characteristics on the page to which the page has been posted.