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What Is Ispostback==false


what is Ispostback==false


View 9 Replies (Posted: Feb 12, 2009 06:39 AM)

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Related Forum Messages For ASP.NET category:
Urlrewriting IsPostBack Always False?
I am working on rewriting URLs Urlrewriting.net, and have run into what seems to be a common problem but I can seem to fix it. I'll present a simplified case.

The URL rewriting is working perfectly with the rule:

<urlrewritingnet rewriteOnlyVirtualUrls="true" defaultPage="default.aspx" defaultProvider="RegEx" xmlns="http://www.urlrewriting.net/schemas/config/2006/07">
<rewrites>
<add name="catalog" virtualUrl="^~/catalog/(.*)/(.*).aspx" rewriteUrlParameter="ExcludeFromClientQueryString" destinationUrl="~/catalog.aspx?cid=$1&c=$2" ignoreCase="true"/>
</rewrites>
</urlrewritingnet>

On the page I have a DataList with 2 asp:buttons inside. When clicked, the page refreshes but does nothing.

I followed ScottGu's article to impliment a form control adapter to rewrite the action of the form to match the rewritten URL.

Page URL in the browser:

[URL]

<form name="aspnetForm" method="post" action="/dev/catalog/13/Music.aspx" id="aspnetForm">

I now see the correct URL on the form action, and when debugging I can see the page load event firing.

The problem now is that every time the page loads Page.IsPostback is false, causing the page to rebind the DataList and therefore ignore the ItemCommand the buttons should be triggering.

if (!Page.IsPostBack)
PopulateControls();

I'm using .NET 3.5 SP1, there is a ScriptManager on the master page but no UpdatePanel on this page. I've also tried resetting the Form.Action property and bypassing ScottGu's solution with the same result. If I go to the page URL directly without using the rewriter everything works fine.

Posted: Sep 29 10 at 1:23

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C# - Whenever RewritePath() Is Called, Page.IsPostBack Is False?
I'm developing a custom URL Rewriter for a ASP.Net 3.5 project. This rewriter is not functionally different than most rewriters out there, the only difference being that the friendly URL collection is not loaded from a web.config file -- it's coming from a database instead. I made the naive assumption that it would be easy to develop a custom rewriter module from scratch, but now I know the mess I put myself in. I digress; let's go straight to the technical issues.

While testing the rewriter, I set up a friendly url that would take the user to a web form. Postbacks from this form should not alter the friendly address, as anyone would expect, sohttp://my.web.site/app_root/FriendlyURL is always rewritten asttp://my.web.site/app_root/not_friendly/form.aspxThings are fine when the browser first loads the FriendlyURL. The page comes up and is completely functional. However, when the form is posted back to the server, the page simply reloads but, at server-side, IsPostBack is false. It's like F5 was hit, except that a HTTP POST had indeed occurred.Unsurprisingly, when the interaction occurs through the "unfriendly" URL, the POST action triggers the postback as expected. This evidence suggests that HttpContext.RewritePath is somehow messing with the page lifecycle in a way that it loses sense of the postback operation.

Posted: Mar 23 at 19:34

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Sessions Lost When The Page Is Reloaded (ispostback = False)?
I have an asp.net page that sets a few session variables. On my development machine (localhost), I do a postback and the session values are still populated.

When I Reload the page by clicking on the url bar and pressing enter the session variables are still there.

However when i deploy this page to a webserver, the page still retains the session values when doing a postback, but as soon as i click the url and press enter the session values are lost (where the ispostback = false)

But when i press the refresh button the session variables are present (but i do get a popup warning me that the page data needs to be resent!)

i am running IE 7, and the webserver is iis6 what am i doing wrong?!

Posted: Feb 27 10 at 16:00

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Web Forms :: What Can Remove All Info From Viewstate And Making The Ispostback Again To False
I have a strange problem, my webform is loading twice.

when i debug i see ispostback is showing false for both times.

what happened to the first time load , and the viewstate.

What can remove all info from viewstate and making the ispostback again to false.

i am having real difficulty figuring out what is causing this problem.

Posted: Apr 23, 2010 03:53 PM

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Web Forms :: Page.IsPostBack Is False Incorrectly After Page Is Idle For About 20 Minute?
When any ofmy page is idle for about 20 minute, and after that if I hit any button, like Sumit Button or any other button,at this time, Page.IsPostbackis again False, and none of the click event is fired and page gets reloaded again.

This happens only if Igo like this, open up any of my webpage, keep it idle OR do nothing for about 20 minute, exactly on 21st or 22nd minute,Click on any of the button on the page, andthe page gets reloaded, click eventdoes not get fired. I debugged for this and I checked the Page.IsPostback value at this point andI got it as False after 20 minute, Idon't know why. It should be True. And because of this my page gets reloaded and nothinggets submitted andevery control is in the blankposition once again and user have to enter everything again.

Butif I enter everything and hit any of the button or Submit button within 20 minute, theneverything works fine,Submitbutton's click event is also gets fired and everything works perfect.

And this is happening in all of my page. I am not sure what configuration is wrong.

But just for more details, I have a master page, I am using Telerik Controls and I have session Timeout set as 60 minute everywhere, in web.config and in IIS settings and in my App_Pool also. On my Master Page, I have ASP:ScriptManager, Tekerik:RadMenu, ASP:ContentPlaceHolder controls and some other controls and javascript code too.

[code]....

Posted: Feb 08, 2010 03:18 PM

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AJAX :: Page.IsPostBack Returns False On Partial Page Update?
I have a page with a (gridview nested within a gridview) in an UpdatePanel (UpdateMode="Conditional"). The nested gridview drops down when you click on an arrow and then you can click on each subgrid rows command field. The gridviews are loaded from the Page_Load event. When I click on the commandfield in the subgrid the Page_Load fires during the partial page postback. From what I have read this is normal with UpdatePanels. But What I don't understand is why both Page.IsPostBack and ScriptManager.GetCurrent(Page).IsInAsyncPostBack test false after I click on the command field in my grid. I need to stop the rebinding of the gridviews ( which causes the subgrid to collapse ) when the command field is clicked.Also: I am using MasterPages and the <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> is located in my mater page form section.Would anyone have any suggestions how to test if a partial page postback is occuringHere is a link to the page source: http://pastebin.org/153774here is a link to the code behind: http://pastebin.org/153781

Posted: Apr 16, 2010 04:30 PM

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Session When Cookieless ="True" Page Ispostback Is Always False?
When Session attribute Cookieless ="True" the page.Ispostback is always false.Cant understand the reason behind it.

And one more thing what is happening when we click Remember Me option in login control.As per my knowledge it is storing authentication cookie in it. If we can add data to authentication cookie then why we need session...we can add session data in that.. and authentication token is also regenerated for every new request like sessions.....i got confused after browsing for few hours.

Which one is more secure using cookies or URL for authentication and session.

Posted: Oct 07, 2010 02:03 PM

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Web Forms :: Logic Behind IsPostBack
have gone through many post but unable to identify how IsPostback peroperty of page works.HTTP is a stateless protocol so how server identify thata client is making request 2nd time not 1st time and set the value for IsPostBack Peoprty.

Posted: Aug 16, 2010 04:40 AM

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Implement IsPostBack Event From Javascript?
I am using ASP.NET. I have to set the value of a variable [testVar] into javascript on page load. only for the first time when the page load. Just like !IsPostBack event on code side. From next postback this function of javascript should not call.

Posted: Dec 2 10 at 9:32

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What Is The Value Of Page.IsPostBack When User Pressed F5
I thought when user pressed Ctrl + F5 will cause page restart, then IsPostBack will be false.

But I found when user only pressed F5 will also leed the page restart, so IsPostBack is also false...

So, if users press F5 unstopped, will it be a problem like too much pressure for server?

is there any way that user pressed F5 we can set the IsPostBack value to be true?

Posted: Aug 02, 2009 02:52 PM

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Web Forms :: Difference Between Ispostback And Iscallback?
the simple difference betweenIspostback and Iscallback..

Posted: Apr 16, 2010 12:32 PM

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Web Forms :: Checking IsPostBack And Getting Error Value Cannot Be Null?
I have an aspx page..when the page loads it need to choose to load 1 of 3 possible user controls....so it looks to a Session variable called ContentType. Once it knows the ContentType, It loads the correct control and stores what type of control to display in the cache. This works fine. now....after the user fills out the form, they submit it and I need to redisplay the page...this is where the problem is arising. When the page reloads...I check IsPostBack and if it is a post back....I read which control to display out of the cache and attempt to load it into the Placeholder control on the page. And here is the error that Im Getting: Value cannot be null. Parameter name: child Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ArgumentNullException: Value cannot be null. Parameter name: child Source Error:

Line 49: { Line 50: //load control from cache Line 51: PC1.Controls.Add((Control)Cache["ControlToUse"]); Line 52: } Line 53: }

Posted: Mar 12, 2004 01:23 PM

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State Management :: Output Cache And Not IsPostBack
I'm trying to cache a complex page with lots of controls on it so that if the user navigates to it later it will look like it did when he last saw it.The page has controls which post back and other controls are populated depending on the selections.

I'm using [Code]....
after the <@ Page directive.

What happens is that a postback gets the cached page, so no processing and it looks the same regardless of user selections. So far so good. But if I browse to another page and return by a link, the cached version is ignored and the default page is created again. This is more or less the opposite to what i want.

I attempted to use the validation callback to ensure that a postback resulted in a new version, and that worked, but it still ignored the cached page if it wasn't a postback.I realise that it will need more work to ensure each user gets their version of the page from the cache, but why bother if this doesn't work.

Posted: May 18, 2010 04:02 AM

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Web Forms :: Access Return Value Of A Function In If(!isPostBack)?
how do iaccess the return value(char array) of a function which is called on page_load inside "if(!isPostBack)"

Posted: Oct 14, 2009 03:30 AM

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If (IsPostBack) Property Inside Page_Load Is Doing Return?
I am looking into someone's code for a production application which is working fine.There is one page (main.aspx) and this main.aspx has 5 user controls inside it.Inside the Page_Load event of the main.aspx and all other user controls the first line of code is:

protected void Page_Load(object sender, EventArgs e){
if(IsPostBack) return;

I am finding this line very strange. As all the button events are postbacks. Then how come this application is working fine?

Posted: Jul 20, 2010 07:47 AM

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Web Forms :: Name 'IsPostBack' Does Not Exist In The Current Context?
I am creating a datagrid dynamically, also creating the columns inside the datagrid dynamically. I just put the paging for the datagrid.

dgScrolls.AllowPaging =
dgScrolls.PageSize = 5;
dgScrolls.PagerStyle.Mode =
true;PagerMode.NumericPages;
dgScrolls.PageIndexChanged += new
DataGridPageChangedEventHandler(this.dgScrolls_PageIndexChanged);
{
protected
void dgScrolls_PageIndexChanged(object source,
DataGridPageChangedEventArgs e)try
{
dgScrolls.CurrentPageIndex = e.NewPageIndex;
loadScrolls();
}

when I run the application, I can see paging, but when I click on the next page, I get an error. I thought that errror might be coming because in page_load, I am not doing if(!ispostback){loadscrolls;} so I put this code in my page_load, now when I put this code in page load, I got the following error. I wasted lot of time, but couldn't figure out why this error is coming

The name 'IsPostBack' does not exist in the current context.

Posted: Sep 02, 2009 04:55 AM

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AJAX :: IsCallback = Fasle And IsPostBack = True?
there is my code

[code]...
please explain why every time IsCallback = fasle and IsPostBack = true? is it ok?

Posted: May 19, 2006 09:48 AM

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Web Forms :: Button.click += New Eventhandler() Not Works In If(!ispostback)?
i want to use button.clcik event in function VIewScrap() which is called in if(!ispostback) but itdoes not works any slolution ?if i do not use if(!ispostback) then also button.click works first time well but in second time it just refresh the page for third time clicking it works what 2 do ? my code is given bellow ...

using System;
using System.Data;
using System.Configuration;[code].....

Posted: Oct 18, 2009 05:46 PM

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Web Forms :: Detect A Pages !IsPostBack In Its User Control?
I have a page that uses a user control, I have to detect the pages !IsPostBack in the User Control and do some operation

In the Usercontrols page Load method I tried using the following variations to detect the first load

!Page.IsPostBack
!Page.IsCallback
!this.IsPostBack
!this.IsCallback
!this.Parent.Page.IsPostBack
!this.Parent.Page.IsCallback

None of these worked, they all fail to detect the parent pages 1st load in the usercontrols page load method

I also tried using

if (Request.UrlReferrer.AbsolutePath.ToString() != "/PreviosPage.aspx")

This worked for Fire Fox and Chrome but not IE (IE has issues with Request.UrlReferrer, it throws a null exception)

So I cant use this approach as well.

Posted: Aug 04, 2010 02:40 PM

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Web Forms :: Dynamically Add Object In Page Causing Second Postback With Ispostback?.
I dynamically add the webcontrol in onInit or onload (page_load). it will cause the second post back and with the ispostback==false;

if first enter the page is no problem. but if I click on the some button. it will trigger postback two times.

first time: ispostback = true.

second time: ispostback = false.

the second time postback caused me headache because all my value has been initialized due to the coding like below:

DataTable _temp;

if(! ispostback)

[Code]....


Posted: Jan 17, 2011 06:51 PM

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State Management :: Code Is Not Working Propely When Using Page.Ispostback
I want to don't let the page to go back ,for that i am using the code to expire the page after the first time it loads so that when second time the page will load it will not find the such page in cache ,but problem is that my code is not working propely when i am using page.Ispostback, iam inserting my code here[Code]....

Posted: May 28, 2010 05:30 AM

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Web Forms :: Server Says IsPostBack=true / DropDownList Dosn't Have AutoGetBack?
When we want to retrieve some data from the site we must use HTTP Get method. My DropDownList must works like a data filter, so I need something like AutoGetBack, but DropDownList have only AutoPostBack.

If I set method="get" of the form, and AutoPostBack=true, then URL will be changed but server says IsPostBack=true. Why DropDownList dosn't have AutoGetBack ?? (with AutoGetBack I use PRG-pattern - unnecessary round trip)

Posted: Nov 19, 2009 05:57 AM

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Web Forms :: Sequence Order For Page.IsPostBack And User.Identity.IsAuthenticated?
What is the best sequence order for Page.IsPostBack and User.Identity.IsAuthenticated? From what I have search for, this comes up most common:

If Not Page.IsPostBack Then
If User.Identity.IsAuthenticated Then
~Some kind of code~
End If
End If

Is this considered "best practice" or can the two items - Page.IsPostBack and User.Identity.IsAuthenticated -be split into their own sections so the fuctions of these can be independent of each other?I am trying to troubleshoot a placeholder that disappears from a master page when a content page button is pressed to change the content pages active view (I have a multiview w/ 5 views inside of it).

Posted: Apr 22, 2010 06:55 PM

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Web Forms :: Updating Email Of Membership / Onload Datais Within "If Not Ispostback"?
I have this form to update a users details.This really should work but doesn't seem to want to update the email, isApproved etc. The onload datais within "If not ispostback". I can't see why this won't work. It is attached to an update button btw.

[Code]....

Posted: Sep 09, 2010 03:28 PM

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Web Forms :: Page.IsPostback Versus Page.IsCallback
what the difference is. When will you use each? What Is the good use of IsPostback? Is this forto not loading data from database if Postback occurs to save on performance? It seems to be working for me, I only load data if not IsPostback.Is this correct? Is this because all my postbacks are generated by UpdatePanel? What is a difference between Postback generated by UpdatePanel versus regular Postback? Is the IsCallbacktrue in this case? Should I check it instead?

Posted: Oct 28, 2007 05:30 PM

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Getting False Value Of Checkbox
publicCheckBox[]cb=null;
intz=0;
protectedvoidPage_Load(objectsender,EventArgse)
{
if(!IsPostBack)
{
cb=newCheckBox[count-k];
//Databasecode.........
while(dr.Read())//readdatafromaccessdatabase
{
cb[z]=newCheckBox();
cb[z].Text=dr["Member_Name"].ToString();
Panel2.Controls.Add(cb[z]);
Panel2.Controls.Add(newLiteralControl("</br>"));
z=z+1;
}
}
}
protectedvoidButton6_Click(objectsender,EventArgse)
{
for(intx=0;x<cb.Length;x++)//ERRORISHERE:Objectreferencenotsettoaninstanceofanobject.
{
if(cb[x].Checked==true)//EVERYTIMEIGOTFALSEVALUE
{
//processingcheckboxes
}
}
}

Posted: Jan 19 10

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Basically, when the page loads i set the div visibility to false. When i click the button, i want the code behind function to be called, and the div tag to be visible, true.

$('#Button2').click(function () {
$('#edit').show(function () {
});
});
<input type="submit" id="Button2" runat="server" value="Search" OnServerClick="Button1_Click" />
but when clicking the button, the page posts back, causing the div tag to be invisible all times.
I can set the return false to the onlclick event of the button , but i need to call the function also.

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A potentially dangerous Request.Form value was detected from the client

It's OK in admin folder though , Because only authorized users have access to work with it . But how about public pages like sections where every users have access to leave comments(using FreeTextBox for collecting users comment ) ? Isn't risky for XSS Attack ? If the answer is not Yes , So what's ValidateRequest property for?

Posted: Nov 2 10 at 8:16

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public static CheckBox[] cb = null;
int z=0;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
cb = new CheckBox[count - k];
//Database code.........
while (dr.Read())//read data from access database
{
cb[z] = new CheckBox();
cb[z].Text = dr["Member_Name"].ToString();
Panel2.Controls.Add(cb[z]);
Panel2.Controls.Add(new LiteralControl("</br>"));
z = z + 1;
}
}
}
protected void Button6_Click(object sender, EventArgs e)
{
for (int x = 0; x < cb.Length; x++)//ERROR IS HERE:Object reference not set to an instance of an object.
{
if (cb[x].Checked == true)
{
//processing check boxes
}
}
}

Posted: Jan 19 10 at 8:59

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<configuration>
<runtime>
<generatePublisherEvidence enabled="false"/>
</runtime>
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Where do I set it for web apps? The blog that this does not go to the web.config. Where else should I put it?

Posted: May 4 10 at 8:49

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i am usingMVC 2 RCand VS2010

when i want to use Ajax for my application IsAjaxRequest returns false

this is my code for view

[Code]....

and this is my controller

[Code]....

also i was added these libraries to my master page

[Code]....

theRequest.IsAjaxRequest returns false

Posted: Mar 22, 2010 02:20 PM

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I have a code below in my gridview.

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[code]....

Posted: Aug 20th, 2010, 03:01 AM

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Posted: Nov 3 10 at 7:37

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[Code]....

Posted: Apr 01, 2010 04:09 PM

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And more importantly, where is this in the nVelocity docs? I've been Googling for quite a while to no avail.

I've tried several different combinations such as:
#if (!$artist.IsFestival)
$artist.FestivalName
#end
and
#if ($artist.IsFestival == false)
$artist.FestivalName
#end

So frustrating!

Posted: Feb 9 10 at 5:12

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I want to store certain html tags in my database to the layout of content, for example <h3> and <p> tags. The problem is with ValidateInput set to True, you get "Potential Danger error" when you try sending content with html tags.

With it set to False, you open yourself to all sorts of potential dangers. So Here is what I'm wanting to achieve:

I hope you like the image ! lol I spent 10 minutes in Photoshop to create it.

So eventhing that goes in, I want as encoded, but when I get content back, I want to decode only the <h3> and <p> tags. ! What do you think of my solution ? Bad, Good ?

Posted: Feb 21, 2011 12:03 AM

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ConvertEmptyStringToNull="false" And Yet The Conversion Still Happens?
etailsView is bound to ObjectDataSource. Inside Detailsview's EditItemTemplate are two TextBoxes ( T1 and T2 ). T1 is mapped to update parameter of type String, while T2 is mapped to update parameter of type DateTime. ssuming both TextBoxes contain an empty string, then when I try to update the data source by clicking on DetailsView's Update button, ODS ( or is it perhaps DetailsView ) automatically converts T1's empty string to null, while T2's empty string doesn't get converted to null. I've tried to prevent ODS from converting T1's empty string to null by setting T1's update parameter's ConvertEmptyStringToNull property to false ( I 've also set <asp:TemplateField ConvertEmptyStringToNull="false" ...>, but to no effect.a)Any idea why T1's empty string gets converted, while T2's doesn't?b) Also, how can I prevent the conversion( BTW - I realize I could convert null back to empty string inside update method )?

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How about if the grid is inside a div, and the div visible=false

Posted: Feb 12 at 17:36

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