What is the difference between “PostBack” and “Cross-PostBack” in ASP.NET?

In ASP.NET, the main difference between "PostBack" and "Cross-PostBack" lies in the scope of the postback operation.

1. PostBack:
PostBack refers to an operation in which a form within a single page is submitted to the server for processing. This results in the page being posted back to itself, and the server-side code is executed to handle the request from the client. PostBack is a common interaction pattern in ASP.NET web forms where user input triggers a server-side event.

2. Cross-PostBack:
Cross-PostBack, on the other hand, involves posting back to a different page within the same application or to a different application altogether. This allows for sharing data or invoking functionality of another page, enabling more complex interactions and data exchange between pages. Cross-PostBack is useful for scenarios where information needs to be passed between different pages or applications seamlessly.

In conclusion, while PostBack is limited to submitting a form within the same page, Cross-PostBack extends this functionality to enable communication between different pages or applications in ASP.NET. This understanding is essential for efficient navigation and data exchange within a web application.