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Determining How ASP.NET Web Pages were invoked.


Posted Date: 13 May 2008    Resource Type: Articles    Category: .NET Framework
Author: Ramasamy.NMember Level: Gold    
Rating: Points: 50



Whether by an original request (an HTTP GET), a postback(an HTTP POST), a
cross-page post from another page, transfer from another page using the Transfer
method or using a callback from the browser.


The Page Page class exposes a set of properties that you can use to determine
how a page was invoked.


1. IsPostBack

2. PreviousPage

3. IsCrossPagePostBack

4. IsCallBack


he following table lists ways in which a page can be invoked and the corresponding Page property values.

Original request
• IsPostBack is set to false.
• PreviousPage is set to null (Nothing in Visual Basic).
• IsCallback is set to false.
Postback
• IsPostBack is set to true.
• PreviousPage is set to null (Nothing in Visual Basic).
• IsCallback is set to false.
Cross-page posting
• IsPostBack is set to false.
• PreviousPage references the source page.
• IsCrossPagePostBack is set to true.
• IsCallback is set to false.
Server transfer
• IsPostBack is set to false.
• PreviousPage references the source page.
• IsCrossPagePostBack that is referenced in the PreviousPage is set to alse.
• IsCallback is set to false.
Callback
• IsPostBack is set to false.
• PreviousPage is set to null (Nothing in Visual Basic).
• IsCallback is set to true.
Note

Be sure you test the IsCrossPagePostBack property of the page that is referenced
in PreviousPage. The IsCrossPagePostBack property of the current page always
returns false.



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