Web Forms :: Repeater Losing Data On Postback

Jul 3, 2010

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Repeater losing data on postback

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Web Forms :: Losing Data Across Postback?

Feb 19, 2010

I have an upload control (csv file) of which I use the stream to retrieve data in a datatable that I then bind to a datagrid, sitting in a repeater control.I have to bind more than one record to the repeater, therefore I need to find a way of storing the stream for each binding, so that I can bind it to the datagrid again, via itemdatabound event of repeater.

I have tried storing the stream in the repeater's datatable but on each postback, the content of the stream gets lost. The stream still exists, but its length is set to 0.I have tried storing it in a session object, but again it is reset to 0.

I have tried using viewstate but I get a xmlserialization error. Saying IXmlSerialization is not implemented.I am desperate to find a work around as I am feeling the pressure at work.

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Forms Data Controls :: Losing Gridview Row Value On Postback?

Nov 3, 2010

i have a global field called hotelId. i then have this piece of code that gets a value from gridview row:


the local variable is assigned to my global one, which gets passed to my method along with other variables. while stepping through i can see the value is set, but when i hit the submit button variabl is passed to another method except my hoteId. it gets lost...

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State Management :: Losing Data Between Postback?

Mar 27, 2010

I am in beginner level on developing web pages. I was coding on desktop applications and as you know it is easy to say that web applications are extremely different than desktop applications.

I wonder why data are lost between postbacks.???? And what is the best way not to lose the data belonging to a specific control (especially gridview). Session or viewstate or anything else?

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Web Forms :: Avoid Losing Dynamic Controls On Postback Event

Sep 8, 2009

I have dynamic controls added during page load. I have the following code If Not Page.IsPostback then do nothing. Now the question is why the controls are still on the page but it's not visible (accessible) from server-side method?

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Forms Data Controls :: Getting Repeater's Field Value Without Postback?

Nov 28, 2010

i use div and repeater to show categories for searching part. there is a div. when iclick it, repeater opens and if i select a category its name shows on div. this part is ok. Now i do searcing. so i have to take the span's value(or repeater's value).

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C# - Losing The Session After The Postback?

Sep 1, 2010

I have been using session variables in my asp.net application for passing the next property:

public bool IsModificationMode
return (bool)Session["ModificationMode"];
set { Session["ModificationMode"] = value; }

In the PageLoad, I set it's value.

Now after the Postback, I am losing it's value having a a NullReferenceException

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Losing Textbox Value On Postback?

Jun 9, 2010

In a page I have a link; clicking on it opens a dialog and sets a textbox value for that dialog.

However, once I click on submit in that dialog, the textbox value is null.


<a href="#" onclick="javascript:expand('https://me.yahoo.com');
jQuery('#openiddialog').dialog('open'); return false;">
<img id="yahoo" class="spacehw" src="/Content/Images/spacer.gif" /></a>


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Forms Data Controls :: Firing Postback From Repeater Row Click?

Jul 19, 2010

I have a repeater which contains a hidden link button that fires when I click a row in my repeater.

Here is the markup for my repeater:

<div id="divResults" style="height: 290px; overflow-y: auto;">
<asp:Label ID="lblNote" runat="server" Text="Note: select a row to edit."></asp:Label> [code]...

Here is the javascript thats added to each row in the rptLocations_ItemDataBound:

"javascript:__doPostBack('ctl00$mainContent$rptLocations$ctl0" + (e.Item.ItemIndex + 1).ToString() +

When I click the repeater row it fires the SetLocationControls method. As you can see my repeater is wrapped in a DIV of height 290px. When the are more than 9 rows in my repeater you have to scroll the div down to view this row. When I click this row it does the postback but doesn't fire the SetLocationControls method. I've had a look in the source it's created the click event to the repeater row like all the other rows. why this method isn't firing on the rows that aren't initially visible in my DIV?

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Forms Data Controls :: Change Literal In A Repeater After A Postback?

Jul 9, 2010

I want to change the value of a literal within a repeater ItemTemplate after postback, based on a value detected at postback.I can't render the whole repeater again though I think because it's actually a radio button in the control that inititates the postback and so I need that control / value to be persisted.

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Listbox Losing Selection After Postback?

Sep 28, 2009

I enabled postback and viewstate. So shouldn't my listbox remember what was selected after the postback?

<asp:ListBox ID="ListBox1" AutoPostBack="true" EnableViewState="true" runat="server"></asp:ListBox>

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Hidden Field Losing Its Value On Postback?

Jun 7, 2010

I have a ascx page where I am using a hidden field to store the value of a the drop down box as it is generated using a google address finder. My problem is that when I try to store the value directly in the hidden field :

hfDdlVerifyID.Value = ddlVerifySS.SelectedValue;

in the event of a button click, the value is stored but on postback is lost again. Whereas, if i try to use Scriptmanager to do it, nothing is stored.

getBuild.AppendLine("$get('" + hfDdlVerifyID.ClientID + "').value = $get('" + ddlVerifySS.ClientID + ").value;");
ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "storeHidden", getBuild.ToString(), true);
// Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "storeHidden", getBuild.ToString(), true);
string test = hfDdlVerifyID.Value.ToString();


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Losing Most Of The Page Content On Second Postback?

Jul 5, 2010

I have a form with a update panel. This posts the form and validates it. Returning a errorMessage string of any invalid field such as "Field xyz is a required field, Field abc needs to be a quantity"

When I enter incorrect date it posts back fine and displays the text in a div at the bottom of the page which the update panel is aimed at to update. (and only this it should be changing)

This works but the second time I hit say (say i enter invalid data twice) the Complete form will disappear leaving me with just the banner of the site and the error message that is returned.

Ive tried commenting out the entire of the code post back so that the button doesn't actually do anything but it still has the same problem(of course this time it wouldnt have a error message created)

So i can only think it is something to do with the updatepanel itself and how it works but i have been staring at this for ages and have no more ideas!

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State Management :: Literal Losing Value On PostBack?

Dec 13, 2010

Never had this happen before. I just upgraded my site from 3.5 to 4.0. Here's the scenario:

1.) I have a literal on a web form, in an UpdatePanel.

2.) On PostBack, the Literal's "Text" property loses it's value. The ViewState is enabled throughout the page. Further, I changed the Literal to a label and it also has this problem. The TextBox's appear to keep their values.

3.) If I remove all of the Ajax controls (which currently is just the UpdatePanel and the ScriptManager) then the Literal control keeps it's value through PostBacks.

4.) There is no client side JavaScript where I'm manually changing the values of these controls. They are only editted in the server side events.

I have read that setting the AutomaticDataBind property in the web.config could remedy this but I can't find any documentation on it and I don't know where to put it in the web.config to even try it.

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AJAX :: CascadingDropDown Losing Selected Value On PostBack?

Nov 19, 2010

I am using the AJAX Contol Toolkit and 4 CascadingDropDown extenders with an ODBC connection in a Web Service. The original load of values in each level works great. I then use these values to set the create the SQL for the SelectCommand for a Gridview.

The problem I am having is that when I submit the page to perform the search, the first 2 dropdowns repopulate and set the selected index accordingly, but the 3rd dropdown does not retain its selected value. It does populate with the values, but the selected value does not get set.

The correct values are available for the SelectCommand which returns the correct values.

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Forms Data Controls :: Property Of Custom Control In Repeater Is Null On Postback?

Jan 12, 2011

A common problem in repeater controls where you want to display data for update (like a list of user phone numbers that can be updated and submitted back to the database) is where to store the database unique row identifier. So, I created a custom Textbox control that I've added a Data property to. I populate this data property with the unique row id. The problem is that when I post back the list and go through the repeater items the control's data property is null. The custom control looks like this:


The tag in the repeater looks like this:


I have a custom checkbox with the same data property and it works fine. I actually put in the same repeater with the textbox control and the checkbox control have the row id on postback but the textbox did not. Is there some limitation on the textbox control that might be causing this.

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Javascript - Disabled Radio Button Losing Value After Postback

Feb 14, 2011

I have two radio buttons that are disabled with javascript when the page loads. RadioButton1 is checked by default. When I click the button to do a postback, the RadioButton1 is no longer checked.

Here's my code sample. The code behind is empty.

<asp:RadioButton ID="RadioButton1" runat="server" GroupName="group" Checked="true"/>
<asp:RadioButton ID="RadioButton2" runat="server" GroupName="group" />
<asp:Button ID="Button1" runat="server" Text="Button"></asp:Button>
<script type="text/javascript">
window.onload = function () {
var RadioButton1 = document.getElementById('<%= RadioButton1.ClientID %>');
var RadioButton2 = document.getElementById('<%= RadioButton2.ClientID %>');
RadioButton1.disabled = true;
RadioButton2.disabled = true;

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Checkbox Losing Value On Postback Due To JavaScript / JQuery Array?

Feb 1, 2011

I have a simple asp:RadioButtonList within a form tag but for some reason it isn't keeping it's value on postback

Here's what I've got


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AJAX :: Losing Javascript Events On Async Postback?

Apr 27, 2010

I am creating a ASP.Net server control to manage locations. The control is a composite control containing several text-boxes, labels, and a link button. I use the AJAX Control Toolkit to provide a modal popup which contains a Bing map. All the Javascript is in its own file and used as an embedded web resource.

The link button is what opens the modal popup. It also needs to call a Javascript function that initializes the Bing map (onclick = "GetMap();"). There are instances when this server control is placed within an Update Panel (and there is no way to avoid this). When in an Update Panel the link button loses its onclick event. I understand that this is because during an async postback the portion of the DOM that defines the content of the Update Panel is thrown out and reinitialized, resulting in the event breaking. When the control is not in an Update Panel everything works as intended.

I have tried registering events on Page.Load and Page.Init, like so:


I have also tried flat out writing the function call to the page:


I have put breakpoints on the lines inside each delegate and they do not get hit. I am not aware of any special way to register events of a composite control's child control or the Page.Load/Page.Init events when being done inside a server control. Is there some special way to register these events? (Note: Both those code blocks above are in my CreateChildControls() method)

Below is the GetMap() Javascript function. As you can see it is pretty straight forward.


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DropDownList Within Composite Control Is Losing Selected Value On Postback

Feb 23, 2010

I am building a composite server control that currently only has a TextBox and a DropDownList. Here is the code in all its foetal glory:


The control appears to work correctly across postbacks, that is until declarative values are set, e.g.:

<squee:Address runat="server" ID="a" Street="123 Fake St" State="VIC" />

After this, the text box continues to work correctly, but the _state member does not pick up the posted back values and instead just sticks to the declared value. I've checked the raw posted values in the Request object, and the new value for the list's UniqueID is there, but _state doesn't pick it up.

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JQuery :: TextboxWaterMarkExtender And Datepicker - TextBox Losing Value On PostBack?

Feb 25, 2011

I have a textbox that uses TextboxWaterMarkExtender and jquery-ui's datepicker plugin.Upon postback, my textbox is losing the value selected from jquery datepicker.Below is the sample code to see the behavior. Is there anyway I can make my textbox to retain selected value on postback?One thing to note is, if I use jquery watermark plugin, it does postback the value. But for certain reasons, I think I plan to use AjaxControlToolkit.


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C# - How To Browser Occasionally Losing HttpCookie For Authentication After Postback And Redirect

Dec 29, 2010

This has been a nagging issue for some time, but very sporadic and difficult to isolate.

From time to time, browsers that have authenticated on a web application, have been open for a while, have logged in and out of the same web application multiple times, have multiple tabs, are pretty much any browser (Chrome, IE, Firefox, Safari), and seemingly at random, lose their ability to retain an AuthCookie after being set and followed by a redirect. Closing the browser and starting a new session resolves the issue, as does opening up a different browser and attempting to authenticate.

Our team uses forms authentication for all of our websites and web application. This is a pretty typical setup where a login form is displayed, the user enters credentials and a cookie is set on the click event of the postback, then a redirect occurs to the same page where the cookie is then referenced and used to complete authentication.

In this situation

FormsAuthentication.FormsCookieName = ".WebAuth"

Within Event:

FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(1, Username, DateTime.Now, DateTime.Now.AddMinutes(SessionTimeout), false, Username); HttpCookie faCookie = new HttpCookie(FormsAuthentication.FormsCookieName, FormsAuthentication.Encrypt(authTicket));
Response.Redirect(Request.RawUrl, true);
After the redirect, on PreInit:
HttpCookie authCookie = Request.Cookies[cookieName];

At this point, the authCookie variable is typically not null, but in these isolated circumstances that I've outlined above, the cookie comes back null after the redirect.

This happens very randomly, sometimes weeks before affecting one of our developers. As I said, restarting the browser resolves the issue.

Today I had it happen on our dev server while using Chrome. I had logged into the application, allowed the application to session timeout, and then attempted to login again. The attempted login then failed to set the cookie. I remotely attached Visual Studio to the process on the server to begin debugging. The entire time I could step through my code, even deploy new code versions to the server with updates, restart the app, restart IIS on the server, attach and reattach to the project, and the issue persisted in Chrome. In Firefox, I was able to authenticate without issue.

From Chrome, the login would validate, attempt to set a Response Cookie as outlined above. Prior to redirect, I could see the properly set Response Cookie, as well as its counterpart in the Request Cookies. However, on each redirect after a seemingly successful login, the Response and Request Cookie are gone.

I enabled Trace on the application to view the cookie collection:

There is a .WebAuth in the Request Cookies Collection, as well as ASP.NET_SessionId and several ASPSESSIONIDxxxxxxxx, but when the page loads, only the ASP.NET_SessionId and ASPSESSIONIDxxxxxxxx cookies are available in the Request.Cookies scope, no sign of the .WebAuth. However, in the page's Trace information after render, there multiple .WebAuth cookies listed, it is just that the page seems to have no access to them.

Primarily, on a working version after authentication there is both a .WebAuth Response and Request Cookie in the page's Trace info. But on a non functioning browser window, the Response Cookie is absent.

Has anyone else had any experience with this? It is such a nagging issue, and so sporadic, but I would love to be able to resolve it. My concern is that it may be affecting users and we would have no knowledge since the description of the issue is so convoluted.

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Installation :: Open Window Losing Focus To Button Postback?

Sep 10, 2008

OK I have a button that opens a window using the onclientclick event and also the onclick event goes to a server side event.

<asp:Button ID="btn" runat="server" Text="UnDock"
OnClientClick="OpenWindow()" OnClick="btn_Click" />

here is the javascript:












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Custom Server Controls :: Extending A Control And Losing Values On Postback?

Nov 24, 2010

I've created loads of user controls, but this is my first time dealing with extending a server control. The problem I'm getting is that the base control's data is not being persisted across postbacks in a Master/Content page.I'm actually trying to get this working using a Telerik control (for my sins), but the same issue happens with a standard Web TextBox control. Code:


Now, I've copied the way I handle the control state as I do it with user controls (ControlState), and it isn't working. Can someone point me in the right direction please? All the examples I find refer to creating user controls, not extending existing controls. Specifically why nothing is being persisted on post back.

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C# - Repeater Within Repeater (ajax Based Web App) - Cannot Use Any Postback Methods

Jun 23, 2010

For the solution, I cannot use any postback methods, because this is all working through ajax. The solution need to be implemented in the asp.net code. I have a List<WebPage> that contains a list of Links (List<Link>) and I need for all the links to bind repetitive information such as page title, id, url. Here is my current repeater.

<div id="result">
<asp:Repeater runat="server" id="results">
<asp:Repeater runat="server" datasource='<%# Eval("Links") %>'>
<tr class="gradeX odd">
<td><%# Eval("Id") %></td> //property of WebPage (part of results repeater)
<td><%# Eval("Title") %></td> //property of WebPage (part of results repeater)
<td><%# Eval("Url") %></td> //property of WebPage (part of results repeater)
<td><%# Eval("URL") %></td>//Property of Link
<td><%# Eval("URLType") %></td> //Property of Link
<td><%# Eval("URLState") %></td> //Property of Link

of course this doesnt work, how can i do this?

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How To Persist The Data From A Repeater After Postback

Jul 1, 2010

I have a repeater that displays financial data and prices for various stocks.

On this page, I also have an "export" button that needs to take the data ~on the screen~ and convert it into a CSV for the user.

The problem is, after I databind my list of "Stock" entities:

List<Stock> stocks = GetStocks()
rptStockList.DataSource = stocks;

The data is not persisted on postback.

Also, the data on this page is constantly being updated via an UpdatePanel and a Timer control (being re-databound each time). Every 30 seconds the prices displayed for the various stocks in the repeater control change.

Now, I have a linkbutton that has a click event method in the code-behind that is supposed to export the ~data on the screen~ for the user. I need to grab the current values for the list of stocks last databound to the repeater. I can't simply go grab the latest values from the database because those will have been changed in the time between the last refresh.

protected void lbtnExportStocks_Click(object sender, EventArgs e)
// No longer have the stock data used in the repeater control

I know that ASP.NET doesn't persist the datasource for the repeater on post-back but I need to still be able to either re-construct this list of Stock entities so I can send them the CSV or I need persist it in some way.

I don't want to do anything that is too heavy handed in terms of performance because during certain days of the week this application can have some heavy usage.

What is the proper solution to this type of situation? Should I iterate through the Repeater's "Items" collection and reconstruct the Stock entities?

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Repeater Databound Loses Data & Event On Postback - Is There A Best Practice Solution

Oct 7, 2010

Currently struggling with a problem that I've encountered variations on in the past. At the moment a worthwhile solution escapes me, but it seems such an obvious issue that I can't help wondering whether or not there's a "best practice" approach I should adopt.Without code, here's the issues in a nutshell:

page has databound control (a repeater) which isn't populated until user inputs data and clicks a button.Repeater item template contains a buttonUser clicks button, page posts back. On load, the repeater is actually empty so event is never handled because the originating control no longer existsGo back to the beginning of wretched cycle I've confirmed that this is the problem because if you provide the repeater with some static data on page load, everything works fine. But of course that's no use because it has to be populated dynamically.Is there a commonly approved way round this headache? I can store the data in session and re-use it on page load, but it seems terribly clumsy.

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Forms Data Controls :: Hiding Table/panel In A Repeater If No Data Repeater In A Nested Accordion?

Nov 10, 2009

Description of issue shown after code listing

Asp code:


The above does not throw any compile errors but it does not work correctly.

accParent produces 6 headings, the first with 3 children, the second with 3 children, the other four each with one child.

The accordion hides the Times and Locations (showme panel) from the first accChild item in the first heading, which is incorrect as there are records to display, but does not hide the panel from the accChild of the last two headings, where there isn't any data to display.

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Forms Data Controls :: Dropdownlist In Repeater And Datasource Doesn't Match To The Data Which Bind To The Repeater

Nov 19, 2009

i have dropdownlist in the repeater and the datasource does not match to the data which bind to the repeater... the error msg: "dropdownlist has a SelectedValue which is invalid because it does not exist in the list of items"

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Forms Data Controls :: How To Print A Message In Child Repeater If No Data Corresponding To Parent Repeater

May 12, 2010

protected void Page_Load(object sender, EventArgs e)


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