Nov 25, 2013 · When the __doPostBack function is called with only one argument, the value in __EVENTARGUMENT can be something like “undefined”. This depends on the browser. I …

This method will populate the __EVENTTARGET and __EVENTARGUMENT fields of the Request.Form with the values from the parameters. The ajaxRequestWithTarget(eventTarget, eventArgument) …

Sep 9, 2021 · How the event is handled on the server without the __EVENTTARGET and __EVENTARGUMENT parameters? Note that in this page the __doPostBack script is not rendered …

Jan 24, 2007 · All we need to do now is to call the SaveWithParamter function from JavaScript. SaveWithParameter ("Hello world!"); Now the page performs a postback and we can now access the …

Apr 19, 2006 · Go to the code behind file and write the following code in the Page Load event: Dim eventArg As String = Request("__EVENTARGUMENT") If eventArg = "MyCustomArgument" Then. …

Oct 7, 2016 · What does __EVENTARGUMENT mean and are there some parameters like it to access? It can be set by calls to __doPostBack in the JavaScript on the page. This article explains it in a bit …

If you observe in the code above, ASP.NET automatically adds two hidden fields (“__EVENTTARGET” and “__EVENTARGUMENT”) and a client-side script method (“__doPostBack”) to the page.

Jul 8, 2011 · The __doPostBack function takes two arguments eventTarget, and eventArgument. The eventTarget contains the ID of the control that causes the postback and the eventArgument contains …

Nov 4, 2025 · To call a C# function from JavaScript, you must bridge this divide using mechanisms like postbacks (full page reloads) or AJAX (asynchronous requests). Misunderstanding this flow is a …

Sep 7, 2012 · But when i am checking Request.Form ["__EVENTTARGET"] , it's value becomes null. When i am doing the same in a normal aspx page (no windowmanager here), it is showing some value.