C# - __doPostBack Is Not Defined?

Aug 13 10 at 20:12

Im getting that error when try to call a __doPostBack on one of my pages, every page that i have in the project use __doPostBack function but in this particular page im getting that Javascript error.i was looking in the internet and the only thing i read is that this error happends when i have a unclose tag but i review the site and its ok.Error: __doPostBack is not definedSource File: htt://localhost:99/ProjectName/Disable.aspx


C# - How To Use __doPostBack()

Aug 28 10 at 17:04

I'm trying to create an asyncrhonous postback in asp.net using __doPostBack(), but I have no idea how to do it. I want to use vanilla javascript.

Something simple like a button click can cause the __doPostBack() event to fire. I'm just trying to learn how the mechanism works.

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.net - Send Value Using __doPostBack?

Feb 7 at 8:07

I'm sending a value (id) from javascript like this:


and at the server side I get it like this:

var id = Request["__EVENTARGUMENT"];

the problem is that sometimes other controls also do stuff and the var id also get's value but not with the value I sent, but some control did.how do I send this value separately so that in var id only the value that I sent using js can be.

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Is It Possible That __doPostBack() Would Ever Send A GET Request

Mar 16 10 at 18:03

I'm having a problem with telerik RadGrid, I want to enable multiple row selection. I also want to go to the server whenever a row is selected or deselected. I created a javascript function to handle the Grid's client side events (OnRowSelected, and OnRowDeSelected). The functions look like this:

function onOperationRowSelected(sender, eventArgs) {
__doPostBack("<%=myControl.ClientID %>", "rowSelected:" + eventArgs.get_itemIndexHierarchical());

The other function is very similar, the only difference is that it sends the string "rowDeselcted" instead of "rowSelected".

On Page_Load I check to see if the request is a Post request using "IsPostBack" and if so, I check to see if it's a rowSelected or rowdeselected.

My problem is when I select a first raw on my grid, a Post request happens (which is expected), however, when I select the second row, a GET request is issued, which (obviously) will result in IsPostBack returning false.

What am I missing here?

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Web Forms :: How Do Call __doPostBack() On Page_load

Jan 12, 2011 08:41 PM

i want to fire post back on page_load

i need to execute my control, whihc i can call on _postback()

how i can do

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AJAX :: How To Cancel __doPostBack Call

Feb 17, 2011 04:03 PM

i am doing this in my client side to make my page load and update a message that is inside and update panel, i associate the keydown event of a textbox control to this javascript:


but the problem with that is if the user type fast the page will do a lot of postback, and i just wanna make the last one, how can i afford that??

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JQuery Call __doPostBack On LinkButton?

Aug 4 10 at 15:14

I have a LinkButton that I need to perform a click on to cause a postback. The actual link target is:


Clicking the link does perform the postback, as verified by a breakpoint in the code-behind. Also pasting javascript:__doPostBack('ctl00$c1$btnRefreshGrid','') in the address bar of the browser works with the same effect.

I've tried the following with no effect at all:


I've tried using both <%= btnRefreshGrid.UniqueID %> and <%= btnRefreshGrid.ClientID %> to generate the selector.

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Web Forms :: __doPostBack Not Firing In Javascript?

Jun 17, 2010 01:57 PM

I am raising an event from the javascript function using the below code.

javascript:__doPostBack('<%=lnkSaveBtn.UniqueID %>','');

The event fires when using the below URL


But when i deploy the project on the production server, it does not raise the event although i have checked that the function getting called but the event is not raised.

In short

* javascript:__doPostBack('<%=lnkSaveBtn.UniqueID %>',''); in javscript works using http://localhost:2000/myProjectName/Home.aspx

*javascript:__doPostBack('<%=lnkSaveBtn.UniqueID %>','');not works when using http://machinename/myProjectName/Home.aspx

I have tried using javascript:__doPostBack('<%=lnkSaveBtn.ClientID%>',''); but still does n't work.

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Firefox __doPostBack Not Working After Idle Time

Feb 22 10 at 14:41

Got really strange Firefox issue. Using the Microsoft __doPostBack javascript function in web forms page. Used for tab control, we have got each tab click calling the __doPostBack function. Works ok on my dev machine with all browsers but got a colleague who has an issue if he leaves the page idle for circa 3 -4 minutes. After this delay if he selects a new tab which calls the __doPostBack function the call to theForm.submit(); just hangs and get requested timeout. No .net calls are seen in Firebug. The __doPostBack event is called just theForm.submit() function just doesn't execute. If he does not have this idle time works ok. It is also ok for him on all other browsers.

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C# - Encountering Error When Doing Post - Back Using __doPostBack()

Oct 29 10 at 6:58

I am getting an error on javascript when doing post back. The code is as follows:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" [URL]>
<html xmlns=[URL]>
<head id="Head1" runat="server">
<title>Untitled Page</title>
<script language="javascript" type="text/javascript">
function DoPostBack()
__doPostBack('Button2','My Argument');
<form id="form1" runat="server">
<input type="button" id="Button2" value="Press me" onclick="DoPostBack()" />

I am getting the following error: Line: 13 Error: Object expected I can't understand why this error is coming.

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Javascript - __doPostBack Rendered After Beginning Or Near End Of Form Tag

Aug 18 10 at 19:24

I'm trying to manually call the ASP.NET (3.5) javascript postback function __doPostBack from my javascript code. The problem is that the postback script block, that is normally rendered right after the beginning of the <form> tag (and the hidden fields), is occasionally rendered near the closing </form> tag. Is there any way to force it to be rendered near the beginning of the form tag? Also, how does ASP.NET decide when/where to render the postback client script block?

Edit > Additional Info: The javascript code resides inside a user control that references the __doPostBack function. The control itself does not contain any 'postback controls' that would call that function. (When I mention 'postback controls', I mean ASP.net controls that call the __doPostBack function and not the asp.net ImageButton and Button controls)

Based on what I've observed and @Brian's comment on the dependency of the postback script on the availability of 'postback controls' on the page, I've found that when the page contains controls that cause postback, the __doPostBack script block is rendered after the opening <form> tag and when there are none, it renders them near the closing </form> tag (or according to this it's not even supposed to be rendered). Now it would make sense for ASP.NET not to render the postback script if there are no controls that require it, but the apparent position of the script near the closing tag is the one that still eludes me. I haven't been able to find any documentation that suggests this behavior. All I've been able to find was this.

Add a 'postback control' and set its visibility to hidden via css (not the Visible property). eg. <asp:LinkButton ID="RequirePostBackScriptLink" runat="server" style="display:none;" /> (this is what I'm using) Add the control to the Page.RegisterRequiresPostBack and implement the IPostBackDataHandler interface.

Finally, as @Jonathan_Bates mentioned in his post, the proper thing to do is to wrap the reference to __doPostBack inside a function that is an event handler to load (or ready if you're using jquery). That way, there wouldn't be a need to depend on the actual placement of the __doPostBack script.

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Web Forms :: __doPostBack() With Button Calling Page_load Twice?

Sep 19, 2010 03:17 PM

i have explicitly added __doPostBack() on Button onclientClick event .


When I am clicking the button the Page_Load is calling twice.

But if I am adding below code inside page load ,page load is calling only once on button click.


and return true is giving me again twice page load ,but adding return true or false in attribute.add code is giving the same result ,only one page load call.


I am not able to understand what is going on exactly I try to add __doPostBack in different way.

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Web Forms :: Manually Invoking A __doPostBack Call?

Sep 23, 2010 03:00 PM

I have a web forms page with a button that involkes a __doPostBack callback to the page. I would like to invoke this manually - by "manually" I mean from outside the webpage, for example by using wget.

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Web Forms :: How To Call __doPostBack Onload In Attribute

Jan 07, 2011 08:15 PM

I have user control which on page and page contain mutiple tab, when i below is problem

my user control load on click of menu , but when 1st time page load my menu already so end user dont need to clcik,

but if menu not click my postback event not fired and give error

i want "="__doPostBack('RiskMapSubTab'" fire when my page load does not matter user clcik this tab or not


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Web Forms - Manually Invoking A __doPostBack Call?

Sep 23 10 at 15:48

I have a web forms page with a button that involkes a __doPostBack callback to the page. I would like to invoke this manually - by "manually" I mean from outside the webpage, for example by using wget.

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Web Forms :: __doPostBack Infinite Loop Using Onfocus?

Feb 15, 2011 02:58 PM

I am calling a method with __doPostBack using the OnFocus event for the controls. However I need to update the values multiple controls when the server method executes. This actually causes on focus to keep firing. Looking for help. I tried using TextBox1.Attributes.Remove("onfocus") and then adding it the javascript after processing but it still keep looping. Here is a sample using to textbox's for simplicity:



Code Behind:


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__doPostBack Reloading Entire Page Instead Of Just The UpdatePanel?

Feb 10 at 16:10

In my javascript, I have the following line:

__doPostBack('MyPanel', MyParam);

In my code behind, I use MyParam to query a database and bind the result to a gridview that's inside the MyPanel updatepanel. The updatemode of the updatepanel is set to conditional and in the postback part of the code I have MyPanel.Update();

The updatepanel works fine when I'm doing sorting and paging; only the panel is refreshed. However, when I trigger the updatepanel with my javascript, I see the traffic in firebug showing that the entire page is being refreshed.

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AJAX :: __doPostBack On Updatepanel Loading Whole Page?

Dec 23, 2009 02:16 AM


__doPostBack on updatepanel loading whole page

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Explicit __doPostBack() - Page_Load Is Calling Twice By Clicking The Button

Sep 19 10 at 15:26

I have explicitly added __doPostBack() on Button onclientClick event.

<asp:Button ID="Button1" runat="server" Text="Button"

When I am clicking the button the Page_Load is calling twice. But if I am adding below code inside page load ,page load is calling only once on button click.

Button1.Attributes.Add("onClientClick", "__doPostBack('Button1','')");

Again if i add with return false it is giving me it calling only once page load on click

<asp:Button ID="Button1" runat="server" Text="Button"
OnClientClick="__doPostBack('Button1','');return false;"/>

and return true is giving me again twice page load ,but adding return true or false in attribute.add code is giving the same result ,only one page load call.

Button1.Attributes.Add("onClientClick", "__doPostBack('Button1','');return true;");

I am not able to understand what is going on exactly when I tried to add __doPostBack in different way.

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Retrieving Information With Python's Urllib From A Page That Is Done Via __doPostBack()?

Apr 11 10 at 11:02

I'm trying to parse a page that has different sections that are loaded with a Javascript __doPostBack() function.

An example of a link is: javascript:__doPostBack('ctl00$cphMain$ucOemSchPicker$dlSch$ctl03$btnSch','')

As soon as this is clicked, the browser doesn't fetch a new URL but a section of webpage is updated to reflect new information.

What would I pass into a urllib function to complete the operation?

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Web Forms :: Why The ValidateRequest Dose Not Work When Html Tags Had Sent By __doPostBack Method In Javascript

Sep 18, 2010 11:35 AM

why the ValidateRequest dose not work when html tags had sent by __doPostBack method in javascript.


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Security :: ValidateRequest Dose Not Work When Html Tags Had Sent By __doPostBack Method In Javascript?

Sep 18, 2010 11:43 AM

why the ValidateRequest dose not work when html tags had sent by __doPostBack method in javascript.




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Button Inside Server Control Doesn't Render Onclick="__doPostback"

Nov 11 10 at 11:33

I'm developing a Asp.net server control (inherited from DataBoundControl) and I have just one button inside it for now which is created in CreateChildControls override. Even though this button have Click event assigned in rendered page the button don't have onclick event with __doPostback or something similar. Am I missing something?


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Type Is Not Defined

Mar 01, 2010 01:59 PM

me how can I fix this error message: Type 'dsFaq' is not defined


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Assemblies / How Is It Defined In The .net

Dec 10, 2009 08:40 PM

what is an assembly? How is it defined in the .net world?

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Looking For A Code That Defined The Namespace?

Jun 16, 2010, 09:43

I'm not really a ASP.NET programmer, but i am learning. Here's my question. IF you had a set of code that was written in ASP.NET 2.0 and used a specific namespace and used @Import command in the header of your page, BUT you did not have any of the code that defined the namespace, how would approach building a development server that would use this namespace?

What page would you define the namespace ? How would you specify the value the a variable contained in this namespace?

I have some templates but they use a specific namespace. I want to setup this same namespace on my server so i can preview the code.

I've downloaded and installed the Visual Studio Express 2010 tool (great free app). Its helpful,

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Type LIST Is Not Defined

Nov 17, 2008 09:32 AM

here i declare a private property.following is my code

Private ReadOnly
Property IDs()
As List(Of
If Me.ViewState("IDs")
Is Nothing
Me.ViewState("IDs") =
New List(Of
End If

here an error occur that is "Type List is not defined".i can't understand what is my wrong here.

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BC30002 Type Is Not Defined

Apr 23 10 at 20:15

used wsdl.exe to create a .cs class for my wsdl service connection.I made a Visual Studio project to compile the .cs into a dll having namespace CalculatorService (CalculatorService.dll).I created an asp.net project added my namespace import:%@ Import Namespace="CalculatorService" %I right-clicked on the project, clicked Add Reference, found my .dll, added it, built the project, checked /bin to ensure my dll was there (and it was).All is well LOCALLY while debugging. It found the CalculatorService, connected to it, got the XML and displayed it.

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Web Forms :: Class Not Defined?

Dec 01, 2010 05:53 AM

I've built an aspx page that insert a value in database, and built a class.vb page that has all the sub and functions to call them from the page... but it's not workingIt gives me an error that the class name is not defined

Here's the code


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C# - How To Use A Listener Defined On Web.Config

Feb 26 10 at 13:17

I'm developing an ASP.NET WebForm application with Visual Studio 2008 SP1 and C#.

I've defined the following listener on Web.Config:

<add name="myListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="D:LogslogWeb.txt" />

How can redirect output from OutPut Window to this listener? All sentences like this:

System.Diagnostics.Trace.WriteLine("IntegratedManaged: ResolveCulture");


System.Diagnostics.Debug.WriteLine("IntegratedManaged: ResolveCulture");

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$ Not Defined For Jquery Script?

Apr 16 10 at 10:10

Do you see any problem with this:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "[URL]">

I'm in ASP.net and I'm using pikachoose jquery slideshow. It works fine in IE and was working in Firefox. However, somehow it's now stopped working in firefox and firebug is giving the doctype line above out as a syntax error and $ is not defined for the jquery script?

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MVC :: Type 'Project' Is Not Defined?

Jul 17, 2010 01:29 PM

Why I am getting this error 'MVCApplication1.Purchase.ProductInfo' is not defined?


<%@ Control Language="VB" Inherits="System.Web.Mvc.ViewUserControl(Of MVCApplication1.Purchase.ProductInfo)" %>
<%@ Import Namespace="MVCApplication1.Purchase.ProductInfo" %>
<%For Each item in Model.Product%>


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Web Forms :: SqlDataAdapter Is Not Defined?

Aug 04, 2010 07:40 PM

I have a typed dataset using a Products table from MySQL.This code works perfectly when placed in the actual aspx page:

Dim productsAdapter As New MySQLTableAdapters.PRODUCTSTableAdapter()

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Vb.net - Web Setup Class Is Not Defined?

Jun 10 10 at 15:11

I've got an ASP.NET application that I installed by creating a web setup. I ran into a problem where ASP.NET wasn't registered with IIS so it gave me a "installation was interrupted" message that told me exactly nothing. Anyhow, I finally got it installed, and I can access the main page, but it's telling me that my class isn't defined. The dll is in the same directory as the Default.aspx page

Here's the main error information

Compiler Error Message: BC30002: Type 'SIValidator.SIValidator' is not defined.

Source Error:

Line 4:
Line 5: <script runat="server">
Line 6: Dim validator As New SIValidator.SIValidator()
Line 7: Protected table As New arrayList()
Line 8: Protected countyByDistrict As New Hashtable()

Version Information: Microsoft .NET Framework Version:2.0.50727.1873; ASP.NET Version:2.0.50727.1433

Am I doing it wrong? Is there some obscure setting that may not be set? I'm completely new to this VS deployment deal.

edit: As an aside, when I searched google 5 minutes later, this entry came up as the first result.

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Type 'ProductsTableAdapter' Is Not Defined?

Jul 03, 2007 08:54 PM

I'm doing the tutorial on creating a data access ayer http://www.asp.net/learn/dataaccess/tutorial01cs.aspx?tabid=63 But I was immediately disappointed by an error:Compiler Error Message: BC30002: Type 'ProductsTableAdapter' is not defined.Well, I surfed, travelled and searched about the whole F%$#IN' www and usenetgroups but no results came up, which was even more frustrating.This error was mentioned in numerous posting and I tried ALL the possible solutions but it never worked. The problem is always the same.The code is just running flawless from my Visual Web Developer 2005 Express Edition. But when I upload the file to my webhost (Brinkster), i'm getting this pesky error.Compiler Error Message:BC30002: Type 'ProductsTableAdapter' is not defined.I copied and past the exact code from the tutorial (just click the above link and scroll down to see it) and pasted it to the AllProducts.aspx.vb file.

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Aug 18 10 at 22:40

I have a couple of controls that are set to runat="server", but are showing up as "not declared" in the vb code behind. They are not being setup in the designer.vb file at all, even if the design.vb is re-created. The only thing that I can think might be causing this is that the controls are inside of a custom control. The code looks something like this (it has been modified because of NDA):


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VS 2008 Web Service - ScriptService Is Not Defined

Oct 27th, 2009, 12:51 PM

I have a page that has a repeater and displays info on a page. The client requests that for each item I need to display further information based on clicking a certain row returned in the repeater.

I am new to creating web services and see a UpdatePanel and see that I need to create a Web Service to use this. So I found the following web site to create a WS: [URL]

With the code below it gives me the error: Type 'ScriptService' is not defined.

How do I correct this?

Oh, it also says to add 'Imports System.Web.Script.Services' but it appears this is old.

Is there a better tutorial to follow then this?


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VS 2008 - Data Context Is Not Defined?

Oct 8th, 2010, 09:56 PM

Error3Type 'LinqChatDataContext' is not defined.

i have above error whne woring with linq

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Sep 14th, 2010, 08:41 PM

I am trying to attach static attachment with email but I am getting following error in my code: Type 'MailAttachment' is not defined.

My code is as follows:

asp.net Code:


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Type 'AjaxControlToolkit.ToolkitScriptManager' Is Not Defined?

Feb 5th, 2011, 08:55 AM

i m getting this error on my certain .aspx pages ,although i added tool kit in my project "Error4Type 'AjaxControlToolkit.ToolkitScriptManager' is not defined.C:UsersIramDocumentsVisual Studio 2008Projectsgfln1gfln1CreateNewConference.aspx.designer.vb3451gfln1

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