Web Forms :: Value Lost On Postback?

Mar 3, 2011

which are the control/thigns in asp.net whose value is lost on page postback.

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Similar Messages:

Web Forms :: Panel Style Getting Lost On Postback?

Feb 24, 2010

dynamically created style of a panel. On postback the style of the panel is getting reset to its design time style. I am assigning the style of this panel using javascript. on dropdowlist's index change, its getting reset.

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Web Forms :: DropdownList Selected Value Clear (lost) After Every Postback

Feb 25, 2016

I have the problem with dropdownlist value inside gridview.my problem is i have textbox,button with two dropdownlists, dropdownlists are inside gridview.Two dropdownlists are  one is ddlcountry and another one is ddlstates. if i select  country from ddlcountry , country related states comes in ddlstates. after entering  first record value in textbox then button click  textbox value is shown in gridview with two dropdown lists dropdown list, after selecting one dropdownlist country and states, i enter second record value and button click then only country selected value visible ddlstates selectedvalue not visible in first record in gridview...

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Forms Data Controls :: GridView Lost Row Colors After Postback?

Jan 5, 2011

I have a c# code that put some background color in cells according with some values, the problem is that each time I add a button or a postback occurs I lost all colors (and other attribs).So my workaround in call the function that fills the gridview each time... but this produce a slow performance.

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Web Forms :: Custom Control Bindable Property Lost Value After Postback?

Mar 24, 2010

I am using: .NET 2.0, VS2005

I customized a button from System.Web.UI.WebControls.Button (it is a Custom Control, NOT an User Control, no ascx file)the intention is to adding a OrderID property to the button, that can be bound to a datasource field.

Here is how this control is used in a aspx page:


Here is my definition of the MYButton class, it saved in a .vb file and placed in App_Code folder


Here is the code trying to use the OrderID in btnSave_Click()


The problem is OrderID is always returned as 0.

When first time page is loaded, and gridview is bind to a data source, I step through the code, and the OrderID property are set correctly, but after the postback caused by the button, the OrderID value has lost.

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Web Forms :: Create Control Dynamically In Place Holder But When Postback All Lost?

Mar 14, 2010

i want to create a few textbox dynamically in place holder but when i created and click on btn and use findcontrol to retrive input data that created dynamically storing data in db , i will receive an error like this :

Object reference not set to an instance of an object

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Web Forms :: Do PostBack Using TextBox On Lost Focus Or OnFocusOut Or OnBlur Events

Feb 20, 2013

i have a text box with autopostback= true

as in the TextChanged event i have code to get details from database.

i need to check if the text value is empty. if yes need  to alert/ display a message and prevent further process.

else fetch the details frm database.

surfed the net and found that onblur and  autopostback= true cannot be used for the same textbox.

whts the alternative forr acheving the desired result.

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Forms Data Controls :: Dynamically Created Checkbox In GridView Are Lost In The Postback?

Mar 3, 2010

In design time I created a Gridview and a delete button in a page test.aspx:


The program stopped at statement "if ((row.Cells[COL_INDEX_SELECTED].Controls[0] as CheckBox).Checked)",

because it cannot find the checkbox created before.

I tried to shift all the code in Page_Load to Page_Init, but the ticked checkboxes are still lost.

I could find the ticked checkboxes names in its request object parameters(this.Request.Params.AllKey) if I setup a breakpoint on the error statement.

Does anyone konw what's happening and how to retrieve the selected rows?

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Forms Data Controls :: Gridview Attribute Changed By Javascript Is Lost On Postback

Sep 10, 2010

I have a gridview control that extends the default gridview. I have added an attribute called "hiddenSelectedValues" to to the gridview during the "PreRender" event and I have a private variable that points to the value of that attribute.

I have some javascript code that modifies the value of this attribute based on the user checking or unchecking checkboxes in the grid. I have confirmed that the javascript is indeed modifying the value of the "hiddenSelectedValues" attribute by using Firebug to see the change as it happens.

However, once a postback occurs, the grid looses the updated value of this attribute and I am unable to reference get the updated value on the server side.

How do I keep the value of an attribute changed by javascript on postback?

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Why Value Lost Every Postback

Mar 16, 2011

just wanna ask if ASP.NET has a Module and Class file also. I used module and class file in every windows application that Im making so that my code is reusable. Does ASP.NET have this also. And ow, someone told me not to use this kind of method.


Public ReadOnly Property Username()
/ CODE Here
End Property

Cause he said the value of it will be lost every postback, why is that ?

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C# - GetIpAddress() Lost After Postback?

Mar 8, 2010

One of my functions in a class is called GetIpAddress() which returns the following string:

This all works well in regular page loads and gets my ip address, but when i for example let a user place a comment, then the ip address is lost after postback and i get an empty string returned.

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MVC :: Postback Happens And Data Lost

Mar 3, 2011

I have an .aspx page which consists of 5 tabs. Each tab content is a .ascx page. i.e. i have 5 ascx pages and on the click on eachtab i load the particular ascx page for that tab. Consider i have one textbox and one button on each of the 5 ascx pages. When i type something in each of the textbox and when i traverse to other tabs the data remains on the textbox on all the pages. But when i click on the buttons on any of the tabs , postback happens and the data is lost. Now what i want is consider i type "Mark" on my txt1 on tab1. and i type "steve" on my txt2 on tab2. When i click on the button on tab1 and traverse to tab 2 i want the data to stay on tab2?

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Hidden Field Value Lost On PostBack?

Mar 12, 2010

I have a hiddenfield, which I want to save the scroll position of asp.panel scrollbar during postback, and when during postback this value is called back to set the scroll position.

Using javascript I can grab the value from the scrollbar, and assign it to the hidden field, but when I post the page back the value has gone.

Here is my code snippet:
<script type="text/javascript" language="javascript">
function SetScroll(val) {
[code].....Am I missing something? How do I keep the value during post back?

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Hidden Field Value Lost When Postback?

Feb 4, 2010

I have a problem

<script language="javascript" type="text/javascript">

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Upload Postedfile Lost During Postback?

Mar 29, 2010

I am using an asp:upload control to upload an image and am using the postedfile property to insert the path to the database. In my form I have a dropdown with autopostback=true where the user can select a topic to populate a checkbox list of categories. During that postback, the postedfile value is being lost and after a little research I have discovered that the posted file value is not maintained in viewstate for security reasons.

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AJAX :: Dynamic Accordion Lost In Postback

Mar 7, 2011

I have an accordion which gets dynamically populated in code behind.on postback, it just shows the accordion has zero panes. [Code]....


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Session Variables Lost On Postback Using AJAX?

Jun 7, 2010

I'm evaluating using Ajax in a new project and so I've developed a simple web page to test a few things, however even the simplest task seems to cause my session to be cleared. I am using VS2008 with .Net 3.5 SP1 and the page is in my existing solution which has several custom handlers and modules in the web.config. Below is the code I'm using, it's a simple test which puts a variable into the session then on the buttons postback tries to get the same variable, however it always fails as the session is blank.

The Default.aspx code snippet
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" /> [code]....

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Dynamic Controls Value Lost During Ajax Postback.

Feb 15, 2011

I have a page to wich I had several controls dynamically. When the page is posted back via Ajax, the values of the dynamically control do not make it server side. However, everything works well if the page is posted back in the normal way ( without Ajax).

I need the post back to be done via Ajax because I need to use the Callback function to perform other tasks in the UI once the call returns.I found this excellent article but it doesn't discuss ajax:


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Textbox With Jquery Ui Datepicker Value Lost When Doing A Postback?

Mar 10, 2011

I've got an application that uses jquery ui datepicker on an asp.net textbox control.The control is working as intended, but I've noticed that when you postback from a server call (via submit button), the entered value gets lost in the application.Was wondering if you all have experienced this? And what measures that you have to do to prevent this?Here is my code:HTML:

<asp:TextBox runat="server" ID="txtCallsMadeFrom" class="field" EnableViewState="true">


var callsMadeFromId = '#<%=txtCallsMadeFrom.ClientID %>';
jQuery(callsMadeFromId).datepicker({ showOn: "button", buttonImage: "../images/calendar.gif", altFormat: 'dd/mm/yy', buttonImageOnly: true, onSelect: function () { } });

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Viewstate Lost On Postback For .net Sitecore Page?

Oct 27, 2010

I'm getting some strange behaviour with viewstate being lost on postback for a .net application using Sitecore. I'm assuming it might be some config variable somewhere but I'm new to Sitecore and don't really know where to start looking.

UPDATE: Sitecore has now gotten back to us with an answer. We had recently added the dtSearch module, and AutomaticDataBind was set to true in the dtSearch.config which overrides the setting in the web config. We've now removed it and it works fine again.

I've made a mini test if that might help. It's two usercontrols on one page, both with a repeater. When updating the viewstate gets lost so even if I'm binding the updated repeater again the data for the other one will be lost.

Usercontrol 1:

<asp:Repeater runat="server" ID="Repeater1" OnItemDataBound="Repeater1_ItemBind">
<asp:Literal runat="server" ID="Literal1"></asp:Literal>[code]....

what might be going on? Let me know if I need to provide any more information. The most annoying thing is that it was working last week but I have no idea what has changed!

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Dynamic Event Handler Lost After Postback?

Dec 22, 2010

I have a asp.net page with a button, the event the button needs to perform on it's click event needs to vary, dependant on what options are selected further up the page. The button itself is included in the master page, and it's actions are affected by selections made in the child page.

To do this, I have a method in the master page, that is called by the child page, when a users presses a button, that passes the Eventhandler to be used by that button, that is then assigned to masterpage eventhandler for that button:

public void assignEvent( EventHandler saveEvent)
this.SaveButtonEvent+= saveEvent

Then, when the save button on the master page, it calls that eventhandler

protected void save_Click(object sender, EventArgs e)
if (this.SaveButtonEvent != null)
this.SaveButtonEvent(this, e);

The event handler is assigned ok in the first section of code, however because pressing the save button causes a postback, the SaveButtonEvent event handler is set back to being null, and so nothing happens.

How can I preserve the contents of SaveButtonEvent Event Handler during postback, or is there a better way to be doing this?


I can get this to work by saving the EventHandler to the session, but this doesn't seem like a great idea.

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State Management :: Lost Object Values In Postback?

Aug 10, 2010

I create a class with some atributes.In a web form, I declare a public object like this.Partial Class Intencion

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Javascript - Hidden Field Data Lost On Postback

Nov 18, 2010

I am working on an ASP.NET application (well supposed to be deploying it about 3 days ago) and my hidden fields are loosing value when the form gets posted back..

I am using them to store information i write using javascript and on my own machine this works fine but as soon as i deploy it on our server everything else works except these values are lost..

I am using the .NET AJAX control toolkit on the same page and have noticed my calander datepicker also looses the data..

I have checked using firebug and the data is definitely getting post to the server but is getting lost somewhere!

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Session Data Lost On Postback Of The Page In Windows XP?

Apr 26, 2010

I have a ascx page on load of the page I save few data in the HttpContext Session, on selection of data in the screen I reload the page with relevant data for the selection. Until here the data in the session exists. But on click of a button say ok button to navigate to next page. all the data in the session is lost. But the same works in windows 7 and windows server 2008 not in windows XP. are there any configuration difference in windows 7 and XP.

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C# - Gridview Attribute Modified By Javascript Is Lost On Postback?

Sep 10, 2010

I have a gridview control that extends the default gridview. I have added an attribute called "hiddenSelectedValues" to to the gridview during the "PreRender" event and I have a private variable that points to the value of that attribute.I have some javascript code that modifies the value of this attribute based on the user checking or unchecking checkboxes in the grid. I have confirmed that the javascript is indeed modifying the value of the "hiddenSelectedValues" attribute by using Firebug to see the change as it happens.

However, once a postback occurs, the grid looses the updated value of this attribute and I am unable to reference get the updated value on the server side.How do I keep the value of an attribute changed by javascript on postback?

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