System.webforms.pagerequestmanager is null or not an object

The object makes available information about what panels were created or updated. For synchronous postbacks, panels can only be created, but for asynchronous postbacks, panels can be both created and updated. Event data is passed to handlers as an EndRequestEventArgs object.

The object makes available information about errors that have occurred and whether the error was handled. It also makes available the response object. The sequence of events varies with different scenarios. The order in the previous table is for a single, successful asynchronous postback. Other scenarios include the following:. Multiple postbacks where the most recent postback takes precedence, which is the default behavior.

Only events for the most recent asynchronous postback are raised. Multiple postbacks where one postback is given precedence, which cancels all subsequent postbacks until it is finished. Only the initializeRequest event is raised for canceled postbacks. An asynchronous postback that is stopped.

Depending on when the postback is stopped, some events might not be raised. When a page is first loaded or when it is refreshed in the browser, only the pageLoaded event is raised. Two common tasks are to stop an asynchronous postback that is underway and to cancel a new request before it has begun.

To perform these tasks, you do the following:. To stop an existing asynchronous postback, you call the abortPostback method of the PageRequestManager class. To cancel a new asynchronous postback, you handle the initializeRequest event of the PageRequestManager class and set the cancel property to true.

The following example shows how to stop an asynchronous postback. The initializeRequest event handler script checks whether the user has chosen to stop the postback. If so, the code calls the abortPostback method. Answered by:. Archived Forums. Sign in to vote. User posted Hi, I have recently upgraded my. I have tried the following.. Tuesday, March 10, PM.

User posted Remove your test script from the page. Wednesday, March 11, AM. User posted First set your app in debug mode, compile the project for debug. Thursday, March 12, AM. User posted included the keys from the web. User posted i have gone thru the tutorials on fiddler on the fiddler website..

Wednesday, March 11, PM. User posted Hi stmarti, thanks for tht. Monday, March 16, AM. I had the exact same problem. Out of the blue. I had the same problem.. The problem turned out to be related to a header the iPad was sending to ASP. The content you requested has been removed. Ask a question. Quick access. Search related threads. Remove From My Forums. Asked by:. Archived Forums. Sign in to vote. User posted I'm using ASP. Wednesday, October 25, PM. User posted Your code is probably executing too early.

Thanks, Eilon. User posted Thank you, Eilon.