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merge aspnetmigration to master (#2668) * Initial aspnet migration * Updating legacy urls * Clearing .gitignore file Clearing .gitignore file because this isnt a normal .net application where we want to strip away debug files, etc. We want to include everything under these folders. * Updating webhooks toc reference * Removing header debug links * Updating webhooks toc * Updating double quotes in metadata to use single quotes * Moving all code blocks to external files * Updating newlines for step-by-step * Fixing indent problem on some code blocks * Fixing newlines in alt attribute for images; Fixing some missing code block references * Resyncing with live content * Refreshing content from production * Trying to get pdf to generate for our aspnetmigration branch * Update .openpublishing.publish.config.json * Refresh from prod; Removing some legacy urls for pages that shouldnt have it * Updating index pages and removing legacy urls * Updating warning and caution notes * Removing downloads * remove aspnet from exclude list (#2549) * First pass at language detection * Updating author and adding in msc.type * Updating code blocks * Updating note styles * Fixing note styles * Updating docfx.json file to allow pdfs and gifs * Fixing note stylings for bold notes * Updating docfx.json to allow exe, zip and wmv files * Fixing note styles with period; Fixing downloads links * Fixing code blocks for razor cs and vb * Fixing more downloads links; Fixing a few code blocks * Removing   html entity * Fixing some more note stylings * Syncing with prod * Fixing issues with content * Rebuilding toc file * Adding back in files accidentally deleted * Fixing some security notes * Fixing some note styles * Updating unknown code blocks * Updating article * Fixing link * Fixing link * Fixing link * Fixing invalid characters * preliminary toc changes * update toc * fix toc folder with only one link * Fixing extra heading * Fixing articles * Reworking ajax pages * Fixing encoding issues * Updating markup in articles * Fixing space * Fixing spacing issues with links * Fixing note styles * Fixing inline note styles * Fixing missing image * Adding space * Rolling back gitignore file and adding a new one for /aspnet * Fixing some code blocks * Updating code block language * Renaming file * Updating code language * Fixing code blocks * Fixing code blocks * Fixing spaces before 'using' * Fixing cs to js * Changing Note type * Updating broken reference * Replacing headings with bolds under notes/tips, etc * Fixing markdown for pipes * Another attempted to fix pipe characters * Fixing markdown for pipes * remove text about being thread-safe (#2630) * Fixing spacing issue with list * Trying to fix pipe issue * new how to choose doc * move choose doc to core folder * add api ref * fix link * Adding in ms.assetid * Removing \ufeff * fix link * link to mvc intro instead of webhooks * add scenarios * put core first, vertical orientation for scenarios * reorganize toc, make overview work like core version * fix yaml * fix broken links * Adding space * add download link * tweak tables * eliminate images * eliminate images 2 * tweak scenario section headings * add link to core in asp.net overview * Removing gears * Updating table * Updating code block languages * fix urls (#2663) * Removing embedded in-article TOC from top of articles * fix urls (#2666) * fix urls * fix urls * Removing embedded in-article TOC from top of articles * Revert "Removing embedded in-article TOC from top of articles" This reverts commit ff1c3ccdf1cf2d705e0bb040144a10fa130796f6. * Revert "Removing embedded in-article TOC from top of articles" This reverts commit 17c37c726d930ec6854b545bab076dffda486ebe.
2017-02-04 05:40:22 +08:00
---
Inserted UID (#3075) * Inserted UID * fixing toc.md
2017-03-28 09:35:25 +08:00
uid: web-forms/videos/aspnet-ajax/how-do-i-determine-whether-an-asynchronous-postback-has-occurred
merge aspnetmigration to master (#2668) * Initial aspnet migration * Updating legacy urls * Clearing .gitignore file Clearing .gitignore file because this isnt a normal .net application where we want to strip away debug files, etc. We want to include everything under these folders. * Updating webhooks toc reference * Removing header debug links * Updating webhooks toc * Updating double quotes in metadata to use single quotes * Moving all code blocks to external files * Updating newlines for step-by-step * Fixing indent problem on some code blocks * Fixing newlines in alt attribute for images; Fixing some missing code block references * Resyncing with live content * Refreshing content from production * Trying to get pdf to generate for our aspnetmigration branch * Update .openpublishing.publish.config.json * Refresh from prod; Removing some legacy urls for pages that shouldnt have it * Updating index pages and removing legacy urls * Updating warning and caution notes * Removing downloads * remove aspnet from exclude list (#2549) * First pass at language detection * Updating author and adding in msc.type * Updating code blocks * Updating note styles * Fixing note styles * Updating docfx.json file to allow pdfs and gifs * Fixing note stylings for bold notes * Updating docfx.json to allow exe, zip and wmv files * Fixing note styles with period; Fixing downloads links * Fixing code blocks for razor cs and vb * Fixing more downloads links; Fixing a few code blocks * Removing   html entity * Fixing some more note stylings * Syncing with prod * Fixing issues with content * Rebuilding toc file * Adding back in files accidentally deleted * Fixing some security notes * Fixing some note styles * Updating unknown code blocks * Updating article * Fixing link * Fixing link * Fixing link * Fixing invalid characters * preliminary toc changes * update toc * fix toc folder with only one link * Fixing extra heading * Fixing articles * Reworking ajax pages * Fixing encoding issues * Updating markup in articles * Fixing space * Fixing spacing issues with links * Fixing note styles * Fixing inline note styles * Fixing missing image * Adding space * Rolling back gitignore file and adding a new one for /aspnet * Fixing some code blocks * Updating code block language * Renaming file * Updating code language * Fixing code blocks * Fixing code blocks * Fixing spaces before 'using' * Fixing cs to js * Changing Note type * Updating broken reference * Replacing headings with bolds under notes/tips, etc * Fixing markdown for pipes * Another attempted to fix pipe characters * Fixing markdown for pipes * remove text about being thread-safe (#2630) * Fixing spacing issue with list * Trying to fix pipe issue * new how to choose doc * move choose doc to core folder * add api ref * fix link * Adding in ms.assetid * Removing \ufeff * fix link * link to mvc intro instead of webhooks * add scenarios * put core first, vertical orientation for scenarios * reorganize toc, make overview work like core version * fix yaml * fix broken links * Adding space * add download link * tweak tables * eliminate images * eliminate images 2 * tweak scenario section headings * add link to core in asp.net overview * Removing gears * Updating table * Updating code block languages * fix urls (#2663) * Removing embedded in-article TOC from top of articles * fix urls (#2666) * fix urls * fix urls * Removing embedded in-article TOC from top of articles * Revert "Removing embedded in-article TOC from top of articles" This reverts commit ff1c3ccdf1cf2d705e0bb040144a10fa130796f6. * Revert "Removing embedded in-article TOC from top of articles" This reverts commit 17c37c726d930ec6854b545bab076dffda486ebe.
2017-02-04 05:40:22 +08:00
title: "[How Do I:] Determine Whether an Asynchronous Postback has Occurred? | Microsoft Docs"
author: JoeStagner
description: "The Page_Load method of an ASP.NET Web form will execute during either a standard full-page postback or an asychnronous partial-page postback. In this video..."
ms.author: aspnetcontent
manager: wpickett
ms.date: 07/25/2007
ms.topic: article
ms.assetid: aabc168b-582a-4668-90b1-3d700285aa1a
ms.technology: dotnet-webforms
ms.prod: .net-framework
msc.legacyurl: /web-forms/videos/aspnet-ajax/how-do-i-determine-whether-an-asynchronous-postback-has-occurred
msc.type: video
---
[How Do I:] Determine Whether an Asynchronous Postback has Occurred?
====================
by [Joe Stagner](https://github.com/JoeStagner)
The Page\_Load method of an ASP.NET Web form will execute during either a standard full-page postback or an asychnronous partial-page postback. In this video we learn how we can use the ASP.NET AJAX ScriptManager to determine whether an UpdatePanel postback has occurred, which allows us to conditionally execute code.
[▶ Watch video (5 minutes)](https://channel9.msdn.com/Blogs/ASP-NET-Site-Videos/how-do-i-determine-whether-an-asynchronous-postback-has-occurred)
>[!div class="step-by-step"]
[Previous](how-do-i-use-javascript-to-refresh-an-aspnet-ajax-updatepanel.md)
Kill BOM and add end newlines
2017-09-20 15:36:55 +08:00
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