Prevent LinqDataSource Where Clause From Resetting On Postback

Jan 13 10 at 20:29

I'm trying to set the where clause on a LinqDataSource object bound to a GridView programmatically on a button click, but when the GridView rebinds data (for instance, when the user sorts) the Where clause resets back to the empty string. Is there a way to prevent this, or is there a better way to filter my results?


Linqdatasource Doesn't Show User Control Label In Where Clause Menu

Nov 13, 2009 07:04 PM

I am trying to configure a LinqDataSource control. On my page I have a user control which has a label in it that stores/displays the person's username.

It user control looks like this:

Partial Class Controls_UserName

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DataSource Controls :: Format Dates And Numbers In A Linqdatasource Where Select Clause?

Oct 14, 2008 04:16 PM

I have a linqdatasource and need to format a number and two dates in the select clause as I'm creating a concatenated field. The code is:

<asp:LinqDataSource OrderBy="ContractReference" runat="server" ID="ldsContract" ContextTypeName="BLL.DBML.ContractLib.ContractDataContext" TableName="ContractDetails"
EnableInsert="true" OnLoad="ldsContract_Load" Select='new (ContractDetailID, ContractReference + " - " + Currency.Symbol + Rate.Value + " - " + EndDate.Value as ContractSummary)'

THis works fine to build my custom ContractSummary field, but of course the Rate (which is a double?) and enddate (which is a datetime?) will be unformatted. I tried using "Rate.Value.ToString("#,##0.00")" but got the error message "Method 'System.String ToString(System.String)' has no supported translation to SQL".

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DataSource Controls :: LinqDataSource Paging When Using "where" Clause?

Mar 04, 2010 11:28 PM

Here is my LinqDataSource


Here is a button inside a listview that is using the LinqDataSource and also has a pager:


And here is the Code Behind that is triggered by the linkbutton:


It almost works. When i click it it loads and shows the current page of objects that have dates that are higher then todays date. Which is what i want. But as soon as you use the pager to go back or forward it reverts to the default, which is ALL articles, sorted by ID. How can i make the "where" selection stick through the paging?

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Security :: Forms Authentication Resetting On Every Postback?

Feb 03, 2010 03:25 PM

I have a web site that works fine on the server. I purchased a new domain and set that up on my web server and set the home directory on to the server to the same location as the site that works.

However, my forms authentication ticket is being recreated on every page post back. Is there some setting in IIS that I'm missing under the new domain(IP)? If I access the site under one domain the ticket is saved and tracked fine. When I access it from the second domain (same home directory as first domain) the ticket is lost on postback.

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Web Forms :: MasterPage Controls Resetting On Postback From ContentPlaceHolder Pages

Nov 18, 2010 12:21 PM

Probably a simple fix to this I am not sure. Basically, I have a MasterPage that contains a Dropdownlist. This DDL controls what is displayed in ContentPlaceHolder. However, when postbacks are caused within the Contact Pages the DDL is resetting itself. How can I keep the selected value for the DDL between postbacks?

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AJAX :: Prevent Scroll From "resetting" When Using Updatepanel?

Jan 09, 2010 05:38 PM

I have an updatepanel with a button inside. When I click the button the gridview inside the updatepanel is getting re-bound to its datasource. But if I scroll the page during this update the scrollbar bounces back to the position it had when I clicked the button (it happens when the update is complete). Can I prevent this in any way? I would like to scroll the page during this update wihout having the page bounce back to the "button click position" when done updating.

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How To Prevent Master Page Postback When Update Panel Asynchronous Postback Happened

Oct 15 10 at 12:50

When an asynchronous postback happened inside update panel, another postback happens also for MasterPage not only update panel embedded page .

I want to prevent this MasterPage postback .

is this possible ? think like i have a MasterPage

and another page which is test.aspx which is content page of MasterPage

i have update panel at test.aspx

when asynchronous postback happens at this test.aspx update panel it also loads MasterPage Page_Load

i want to prevent this (it should not also load MasterPage Page_Load)

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AJAX :: How To Prevent Master Page Postback When Update Panel Asynchronous Postback Happened

Oct 15, 2010 12:49 PM

When an asynchronous postback happened inside update panel, another postback happens also for MasterPagenot only update panel embedded page .I want to prevent this MasterPage postback . is this possible ?think like i have a MasterPage and another page which is test.aspx which is content page of MasterPagei have update panel at test.aspxwhen asynchronous postback happens at this test.aspx update panel it also loads
MasterPage Page_Loadi want to prevent this (it should not also load MasterPage Page_Load)

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Page _ Load Postback Clause Loads Controls Differently?

Oct 01, 2009 02:07 AM

Ive had several problems creating controls from page load during post back. I thought I came up with a solution but it only works partially. In a nutshell here's what happens:

I have a button that fires a java script function. The function performs a postback. page_load determines what control caused the postback by looking at Request["__EVENTARGUMENT"] If the EVENTARGUMENT starts with something specific, it calls the CreateDropDowns method CreateDropDownMethod creates a bunch of new dropdownlist In another method that is fired from a seperate button, FindControl is used to find all the newly created dropdownlists and get their selected values. The problem is that findcontrol can't find them! I know that the if clause is evaluating to true beacuse the dropdowns are created. But heres what's weird: If i run the CreateDropDowns method in page_load without wrapping it in the if clause that examines the EVENTARGUMENT, then FindControl find them. Whats the difference if its called from within an if clause or not? Either ways, its called from page load. Below is the Java Script on the aspx page:


Here is the button that calls the javascript:


In the code above, the dropdowns are created but findcontrol can't find them. If I change page load to the following, find control finds them:


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Binding Data From LinqDataSource To Textbox / How To Bind Texbox To One Property From Linqdatasource

Sep 1 10

How I can bind texbox to one property from linqdatasource?

I mean something like databinding contols in c# app

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C# - How To Prevent Postback By Javascript

Oct 28 10 at 10:22

actually this code is working well in firfox mozila but it's not working in IE8


here i want to prevent postback when answerlength == 0 ; but when answer length ==0 then it alert alert("u can't submit blank answer") message and postback to server io want to prevent it how i do ?

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Prevent Duplicate Postback In (C#)

Aug 27 10 at 10:27

Simple one here... is there a clean way of preventing a user from double-clicking a button in a web form and thus causing duplicate events to fire?

If I had a comment form for example and the user types in "this is my comment" and clicks submit, the comment is shown below... however if they double-click, triple-click or just go nuts on the keyboard they can cause multiple versions to be posted.

Client-side I could quite easily disable the button onclick - but I prefer server-side solutions to things like this

Is there a postback timeout per viewstate that can be set for example?

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Web Forms :: How To Prevent PostBack When Using DropDownList

Mar 24, 2009 06:17 AM

I want to prevent postback on dropdownlist when SelectedIndex==0 otherwise it remains true.

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Prevent Postback When Page Is Loading?

Oct 06, 2010 12:34 PM

I am a problem with Postback event.

I have a web page (aspx) which takes longer time to load the page. If this page is loading and if user requests same page by clicking menu link again, it is considered as not postback and page starts loading again (as soon as it finished first page load).

I want to prevent this from happening. When page is loading and user requests same page again, it should not process those requests and should be neglected.

This aspx page is requested from menu (which is designed on seperate master page).

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VS 02 / 03 Prevent Data Loss In Postback

May 20th, 2009, 02:13 AM

Want to ask some answers for my current problem.I have a page which has dynamically created controls on it. 1. One Place holder. (already on page) 2. Two Tables which includes data and textboxes. (Created dynamically and use PlaceHolder.Controls.add to add it on form) 3. One "Save" button. (Already created on page but use PlaceHolder.Controls.Add to add it and move its location.) User will fill in some information in the tables' textbox. There will be 12 text box per row and total over 400 rows. (Of course, user will not fill up all textboxes. Just a few 10 or 15 rows and user will enter remaining value in 'The rest: ' textbox.) When user finish, he will press the "Save" button. Problem is after pressing this button, it didn't go to button click event first. It goes to Page_init event first and then comes to button click event. So, in the middle of somewhere, the form is brand new and there is no data inside the textbox when it reached button event. How to prevent this from happen? What I found so far is: I read some post indicate to declare the dynamically controls in Page_Init event instead of Page_Load event. So, I did it. And so when pressing button, it goes to Page_Init and so my dynamic controls all become new.

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How To Prevent Postback On Button Click

Jan 11th, 2005, 10:17 AM

I have this one window which is a webform for a service request. On the form are buttons that will open another window to allow the user to make choices which will then get returned to the opening window. The problem is that unless the values are returned to textboxes the returned values will get wiped out when you click a button to open another window. Such as the HTML that I return to a label for display purposes.

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How To Prevent PostBack On The Client Side

Jun 11 10 at 13:56

I have some validation JS code on client, that must be executed befor PostBack.If this validation code return 'false', postback is needless.How it can be disabled?

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How To Prevent Closing Of ModalPopup On Postback

Feb 3 10 at 2:45

I'm using the ModalPopupExtender control from the AJAX toolkit. This control extends a panel which contains a CreateUserWizard control. However, the validation of the CreateUserWizard control causes a postback to the server, which closes the popup. I'd like the popup to remain open, even after the postback.


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JQuery :: How To Prevent Postback For Dropdown

Feb 08, 2011 04:12 PM

In dropdown when i select value(not text) "0" it should not go for postback,

to do this i am using e.preventDefault();

if i select other than "0" it has to go postback.

but,it is always going for postback ,the e.preventDefault(); is not working.

How can i achieve this in jquery?

return false; is also not working.

i am sure that i am selecting the value "0", i checked it by using alert();

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Web Forms :: Prevent TreeView Postback On OnSelectedNodeChanged?

Jun 11, 2010 06:11 AM

I have a treeview loaded with nodes. When I click on a node that is set to .Selected, I want a frame to load with that node's objects. Instead, it appears that the TreeView is posting back and causing the node that was clicked to be lost. For example,setting the below function to OnSelectedNodeChanged causes a NullReferenceException.

Protected Function LoadObject(ByVal sender As Object, ByVal e As EventArgs)
Dim node As TreeNode = tv1.SelectedNode

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How To Prevent PostBack Event Handler From Firing

May 3 10 at 20:32

I have a custom class (ServerSideValidator.vb) that validates user input on server side (it doesn't use any of the .NET built in validators, therefore Page.Validate() is not an option for me). I am calling the Validate() method on page.IsPostback event and the class performs without any problem

My issue is, when validation fails (returns false), I want to stop the postback event handler from firing, but load the page along with all the controls and user-input values in them. If I do, Response.End(), the page comes up blank. I can programmatically instruct the page to go to the previous page (original form before postback), but it loses all user-inputs.

I thought of creating a global boolean variable in the page code behind file and check the value before performing any postback method, but this approach takes away from my plan to provide all functionalities inside the class itself. The page object is being referenced to ServerSideValidator.

Seems like all the postback related properties/variables I come across inside Page class are 'Readonly' and I can't assign value(s) to control/prevent postback event from firing.

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AJAX :: Prevent Postback On A Single Tab Within Tabcontainer

Apr 28, 2009 03:24 PM

I have a TabContainer object with 5 tabs. I have autopostback set to true and within all of the <ContentTemplate>'s of the <TabPanel> I have <Panels>. Everything is working fine except I need to prevent the postback on the 3rd tab (I have a hover menu that appears requesting additional information I need for that specific postback). I have tried setting the OnClientClick="return false" on the TabPanel I want to prevent the post back from, but it throws errors and does not display the tabcontainer anymore. Also, this is inside of a UserControl inside of the hosting page.

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C# - Prevent Postback After Opening JQuery Dialog Box?

Dec 8 10 at 7:38



This code opens me a dialog box with Ok and Cancel button but it do not wait for user activity and post the page immediately and the label gets populated. I need to call the c# function based on user activity. If user clicks "Ok" label should get populated and if user clicks "Cancel" it should not call the c# function. How do I achieve this?

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C# - Prevent The AsyncFileUpload From Sending The File Again On Postback?

Jul 12 10 at 16:10

I am developing an application that manages a photo contest. In that application, I use an AsyncFileUpload control for the user selected photo. The server-side UploadedComplete does basic validation, and scales/clip the image as necessary.

The problem is, when i click on the submit button on the page, the content of the AsyncFileUpload gets sent with the other user-submitted data, so the user gets to wait twice as long to get a response from the server (I'm expecting photos that are between 3 and 7 Mb big, which takes a minute or two to upload).

My form looks like that:

<%-- ... snip - all other fields ... -->
<div style="margin-top: 20px; margin-bottom: 5px;">
<span class="texteB"><b>Upload a photo</b></span><br />
Browse your computer to find a photo.</div>


Is there something I missed out in the documentation? I've been working on this all day without much success.

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JQuery :: Prevent Panel From Closing On Postback?

Mar 20, 2011 09:45 PM

i have some jquery code that I use to toggle a panel (pnlAddBuilding)

In this panel there is a dropdownlist that does an autopostback. When the postback occurs the panel closes.

How do I keep it open?


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Web Forms :: FileUpload Control Prevent Button Postback?

May 31, 2007 12:40 AM

We were debugging a bit of code today and noticed that if someone puts an invalid string in the text of a Fileupload control it prevents another button on the form from firing. For example, the form:


If something invalid is entered in the "fileupload1" control, pressing "Button1" does not cause the click event handler to fire. Does anyone know why this occurs?

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Web Forms :: How To Prevent Postback When Page Is Refreshed Or F5 Pressed

Mar 22, 2010 01:14 AM

I need to display a popup dialog box when an Aspx page first loads. I do this inside of the page load method
with PageIsPostBack.

How can I prevent the popup from being displayed though when the user hits the refresh button or F5 button.
Or the back button?

// Dispaly popup here

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How To Prevent Postback Events From Firing On Page Refresh

Nov 20, 2007 05:23 AM

when I am developing a web application I am facing the below mentined problem::

Button_click event is fired when user hit refresh (F5) in browser.

This behavior is easily reproducible:

Place ASP button on Web Form

1. Add some code to Button_Click event

2. View page in browser

3. Check that your code being executed when you hit button

4. Refresh page and observe that your code being executed once again

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AJAX :: Prevent Full Page Refresh During Postback?

Jan 26, 2010 07:53 PM

I have 2 checkboxes (yes/no) that when selected cause the entire page to refresh during postback mode. How can I elimiate this?


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Prevent Postback In Array Of Linkbutton Created Dynamically?

Mar 25 10 at 5:25

i have created Array of Linkbutton and when user click on link button it will create an array of Radio Buttons but it requires Postback all time so page load takes more time...

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How To Prevent Loading Of Data When Postback Fails Validation

Feb 5 10 at 0:49

I'm trying to prevent data from loading on the page when its needed.

Currently, I check the IsPostBack bool to prevent loading data in my user controls which allows the data to be loaded when the page is initially requested.

However, if my page fails validation and the page is sent back to the user with error messages, my user controls no longer have data in them because the initial request was a postback.

One solution is to have a flag in every user control (IsFailedPostBack) to force them to reload their data. Is there a better way?

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JQuery :: Prevent Postback For Dropdownlist On Onchange Event?

Mar 07, 2011 08:24 AM

i have a dropdownlist whose autopostback = true , but for some selected text i do want tht the autopostback really shouldnt fire .. using jquery...

however i hav really tried out using removeAttr() to remove attribute and then evt.preventDefault() which ofcourse should prevent the postback...

also tried to set the evt.returnValue = false so that the value returned by the dropdownlist change event is false ...

d code snippet i tried out is like :


none of the above resulted in stopping the postback..

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C# - Prevent Updating The Content Of The UpdatePanel From The PostBack Of The Page?

Jan 30 at 14:05

How to prevent the content of the UpdatePanel from the PostBack which is occurred in the whole page ?

I have the following code:

<head runat="server">
<script type="text/C#" runat="server">
// I don't want it to call this event handler


The previous code will write in the TextBox2 in spite of it exists inside an UpdatePanel with Conditional for UpdateMode.

I want it to update only when I call UpdatePanel1.Update();

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Web Forms :: Prevent Auto Postback From A Textbox When Return Is Pressed

Mar 07, 2006 08:35 AM

Is it possible to prevent a Textbox from peforming a post back when the user presses the return key? I have seen some posts indicating that you can trap and ignore the return key using JavaScript, but that seems like a bodge to me.

What I've got is a Textbox on page with a hyperlink button next to it. I have code in the click event of the button which then performs some processing. At the moment the form submits itself when the user enters text into the Textbox and presses return. I suppose another solution is to perform the processing on the changed event of the textbox, but that doesn't fire if the text in the box hasn't changed.

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Web Forms :: Prevent A Postback From A Button In User Control Inside A Modalpopupextender

Apr 12, 2010 10:33 AM

HOW can I prevent a postback from a button in user control inside a modalpopupextender, so that the modalpopupextender doesn't close?

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State Management :: How To Prevent Session Timeout During Files Uploading (postBack Free Up-loader)

Sep 23, 2010 06:44 PM

i am using a multi selecting file upload control which is postBack free.

I am using session timeout.

My problem is that during files uploading my session got expired. Bcoz my uploader not being postback so i can't enhance session timeout. and while uploading my session got expired and process was not ompleted, causes some imp files could not uploaded.

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Forms Data Controls :: Prevent DataGrid From Binding Data On Non Postback?

Apr 06, 2010 05:19 PM

I have a DataGrid bound to an ObjectDataSource, as you know once the DataSourceID on DataGrid is set, data binding happen automatically without any coding. But due to requests from end users, I need to prevent the data binding when the page is loaded the first time, i.e. data binding should only happen during PostBack. How do I do that?

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Monitor If Production Application Is Resetting On Its Own?

Dec 21 10 at 18:19

Can I objectively determine if my production ASP.NET web application is resetting its application pool? It could be for whatever reason (for example, an error occurred or memory topped off). I don't have direct access to my production servers, so when I want something on the server, I have ask specifically for it like PerfMon counters to run. It is a running IIS 6.0. I understand that I could use PerfMon to catch ASP.NET Application Restarts. If I was not monitoring that PerfMon, is there anything that can tell me the application restarted sometime in the past?

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Server - Global Asax Resetting Once In A While?

Aug 26 10 at 7:52

I've got an website running on a third-party hosting server. Now I've got a few objects in global asax. But once in like 6 hours or so (didn't really check how long) the object gets reset to default values.Is this an problem in global asax that it reset's himself or is this the server on which I'm hosting?

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