Web Forms :: Loosing Values Between Postbacks?
Jun 30, 2010
I have a page, where I dynamically add textboxes within an updatepanel with a button.click event. Those are common telephone, fax, email, etc.. Now I put in some values, store those in Session with Arraylist and go to next page. Here, there is a button to go back to previous page. Ive managed to recreate all those textboxes on Page_Load event, using if not page.ispostback, then.. Now, this problem is driving me crazy. When I load my page, put in some values, add as many textboxes, as I want and go "Next", its ok. Then I go "Back" and everything is recreated and I see as many values within textboxes, that I created. But when I do this for a 2nd time, I can only see recreated textboxes without values. Ive spent some time searching for a simple solution, or an advice. But with no success. I could post some code here, but its a bit long and complicated. But if necesarry, I will.
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Feb 5, 2011
I am having tough time finding out this reason. I have a web control where i add some variable in viewstate. like viewstate["test"] = "1".
when i post back this viewstate no more exists in collection.
[Code].....
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Oct 26, 2010
I have a page with an asp:FormView. When I attempt an insert and it fails I loose the data in the form. ViewState is enabled.
<asp:FormView ID="frm_Person" runat="server" DataKeyNames="Person" DataSourceID="ds_edit_Person" DefaultMode="Insert" ViewStateMode="Enabled">
I am trapping the error on the datasource with
<asp:SqlDataSource ID="ds_edit_Person". oninserted="ds_Edit_Person_Sql_Event" onupdated="ds_Edit_Person_Sql_Event".
(ErrorHandler is just a static lookup function):
protected void ds_Edit_Person_Sql_Event(object sender, SqlDataSourceStatusEventArgs e) {
if (e.Exception != null) {
SqlException sqlex = (SqlException)e.Exception;
lbl_Error.Text = ErrorHandler.TranslateError(sqlex.Number);
e.ExceptionHandled = true;
}
else {
lbl_Error.Text = ErrorHandler.TranslateError(0);
gv_Person.DataBind();
}
}
How do I keep the values in the form?
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Mar 29, 2011
this is about ASP.NET, ViewState, UserControls and loosing the values of my properties. It is an classic question by know, I know, and even though I have searched here and on Google for a resolution to this problem, I havent succeeded. On the contrary, the more I test different things, the less I understand it seems.
On top of this I am using ext.net and their so called DirectMethod's but I dont think that has much to do with this problem. There are numerous questions I have and I hope that this text will be fairly readable and understandable =)
The UserControl
I have a UserControl, Customers.ascx, that contains some Properties. The "most" important is *_CustomerId*. The _CustomerId is set in code-behind, in ext.net's "DirectMethod" like this (code below from the Page Customers.aspx):
[code]....
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Nov 11, 2010
I've created a gridview and one of the columns displays a field called "usegolive". In the table this value is either 1 or 0.I'd love to know how to convert this so it's displayed as either "yes" or "no" without loosing the underlying values. Seems fairly straightforward but I cant figure it out.
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("usegolive") %>'></asp:Label>
</ItemTemplate>
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Jul 3, 2010
i m using jquery in many of sections in my asp.net applications for server controls like multiple file upload using asp:fileupload, autocomplete using asp:textbox. Everything works fine & gets save in database also.But the problem is that whenever a postback occors "before a save event" it clears all textboxes vales which are utilizing jquery functionality. e.g. if i type 'U' in country autocomplete textbox, it gives 'USA', 'Uganda' etc, i select one of it & it sets the text of textbox as chosen item. But somehow, result is not saved due to a logical error. So the value in textbox gets cleared & i have to again type in textbox before save.
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Jul 16, 2010
I have a Listbox getting populated when the page loads itself and also in postbacks. Some items are already selected in that listbox even when the page loads or postbacks. I have to select one or more items in that textbox in addition to the selected one.
Till this point, it works perfectly, but the problem is that when i click an "update" button to save the newly added items, then also the page postbacks and so the list box get populated again. This will loose the newly selected items and none of the newly selected items will be saved.
So what should i do in order not to loose the newly selected items when i click the "update" button.
Note:- I need to populate the listbox on postbacks also. So the population of that listbox on postbacks cannot be discarded.
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Oct 18, 2010
I'll try to specify my problem as simple as possible! I have a problem comunicating between 2 pages; Products.aspx and ProductDetail.aspx. On Products.aspx i have about 15 DDL's on the left side (all set to autopostback), and 1 ListView ond the right side. Results in my ListView control are based on selcted items from DLL's on the left. Every single result in Products.aspx has a dynamical hyperlink to the ProductDetail.aspx. Now when I click on specific product in ListView I'm redirected to ProductDetail.aspx page, and everything works fine! If I click on the Back button in IE or FF it works also fine because it returns me to the previous Products.aspx page and all my results based on selected items in DDL's are still there!
The problem comes when causing some more autopostback's in ProductDetail.aspx page, because every autopostback is counted as a new page request and therefore i have to click Back button in IE or FF for more then 1 time to come back to the previous Products.aspx page.
I tried to implement code BELOW in ProductDetail.aspx.vb but it does not completly fulfill my expectations, becase all my searching criteria are lost when returned to the previous page (Products.aspx)
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
ViewState("ReferrerUrl") = Request.UrlReferrer.ToString
End If
End Sub
Protected Sub BACK_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles BACK.Click
Response.Redirect(ViewState("ReferrerUrl").ToString)
End Sub
Does anybody knows any other solution how to come Back to previous page with only ONE CLICK without loosing searching criteria?
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Feb 5, 2010
Am new to asp.net.I am creating a site using asp.net(C#), in master page i have treeview control, when i select a item i navigate to url. But selected node is lost, it reset itself, loosing state.
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Jul 19, 2010
I have an ASP.Net site that has master pages. The master page has some calls to functions to get information from a database. Then in one of the parts of the master page I have form that modifies that information. So when the user clicks a button the information in the database is updated but the display of that information doesn't update until the page is refreshed or another link is followed.
I would like to know how to force a page to refresh without loosing VIEWSTATE information so that the newly updated data in the database will appear correctly on the screen.
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Feb 22, 2011
I have three identical procedures that are all used to open the contents of a GridView into Excel. One was working fine but the other two were getting a 'RegisterForEventValidation can only be called during Render();' error when attempting to run the form.RenderControl(html) command. The only difference I saw was that the one that was working had the allowsorting value set to 'False' where the other two were set to 'True'. I set the other two to false and they worked. So what is going on here? Why would this cause the error; is the GridView somehow doing a post back and loosing settings when this value is set?
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Mar 5, 2010
Can any one let me know "How to load the dynamcially added HTML Controls(Controls added using javascript) during the postbacks without loosing their values?
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Mar 29, 2011
I'm using Wizard control to collect some information. I have Repeater control in my Wizard control. when client inputs information and clicks next button he gets to next WizardStep, thou from next step when client clicks previous button and navigates to previous step Repeater control's input fields are empty. How can I store client input so when he will navigate back he could see previously added information. I don't want to use any client or server side session management techniques, because I think viewstate is enough. I think my problem is I don't bind Repeater control in a right place, besides, all the controls inside my Repeater control are loading dynamically.
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Apr 15, 2010
I'm having a weird problem with one of my .net windows applications. I store a number of settings in the application settings (User Scope) but from time to time the settings just seem to dissapear when it's run on the server.
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Oct 11, 2010
i have a datetime column which has dates with milliseconds, but when i make a query and try to read that column i get the correct datetime but without dhe milliseconds.
I use a conversion like this: DateTime oColumn =DateTime.Parse(oRow["Start"].ToString());
Is there anyway to get the milliseconds from the column.
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Mar 22, 2010
I basically have an update panel being dynamically populated with a LinkButtons after a postback. This link buttons are being assigned an event. Now when I click the button the event is not firing. As I understand it the event is not firing because I'm not creating the button in the Page_Load event and therefore .Net does not remember this controls were created after postback. I'm not able to create these controls in the Page_Load as they are dependant on user input. So my question is how can I create these controls dynamically and have the page retain them and their events after postback?
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Feb 9, 2011
I have a asp.net page with a codebehind. I have 2 buttons on the page. When clicking on button 1 I get some data from my database and save it for later use in Sessions.
[Code]....
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Sep 23, 2010
If I was to copy and paste the syntax below
<div
id="FabricSearchFabricSupplierText"><div>
it would come out as
<div
id="Div1"><div>
How do I stop it being changed to Div1?
I have looked under Tools | Options
I obvioulsly reuse my divs style definitions.
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Dec 29, 2010
I am using JavaScript's PageMethod functionality where I am invoking a PageMethod which works like a gem. However I am having an issue in accessing the HttpContext's state which returns me a value "SYSTEM" for
HttpContext.Current.User.Identity.Name
which is not the actual current User Name.
I know there are couple options like storing HttpContext.Current in a Session or saving Context's state in some other custom container but given a web farm environment I am assuming that this will not work as expected.
Here is the code I am working on with
function MyFunction(){
PageMethod.MyPageMethod();
}
here is the signature of the server method
[System.Web.Services.WebMethod()]
public static void MyPageMethod()
{
// gives me "SYSTEM"
var user = HttpContext.Current.User.Identity.Name;
}
Also if I use the above code to access user name in OnLoad event of the page then it works fine and returns me the CurrentUserName.
I am trying to get the above code to work in an ASP.NET Webform... :)
So I am wondering if there is a way to access the current actual user in page methods without making use of sessions.
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Nov 1, 2010
I am using IIS Url rewrite to convert urls from /mypage.aspx?q=value to /page/value.html.
Everything works fine during the first call to the page but on postbacks the url is transformed into
/page/value.html?q=value
when using asp controls such as GridViews, Pagers or Custom Controls.
As a result the Server returns a 404 Error and i can see the corrupted url on the browser's address bar.
This problem was observed when i wanted to change the page of a gridview using a pager.
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Dec 31, 2010
I would like to save some data for use after a page postback. Here is an example of what I'd like to do:
Partial Class TestPage
Inherits System.Web.UI.Page
Private _CategoryID As String = ""
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
_CategoryID = "ABC"
Me.ViewState("CategoryID") = _CategoryID
Else
_CategoryID = CType(Me.ViewState("CategoryID"), String)
End If
End Sub
End Class
I've tried both session variables and view state. The page loads fine initially, but on postback I get the following error:
Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
What am I doing wrong? How can I save this data for use after postback?
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Feb 17, 2011
I am having a problem with postbacks on my live server.I have added a button to my page with postbackurl="google.com when I press the button it is doing nothing but If I put response.redirect("google..
in the code behind button click event it will work?Is there an simply reason that the postbackurl is not doing anything?
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May 26, 2010
i am currently working on a webform that has several dynamically populated dropdown lists. this works just fine, however, i have other web controls that require to have a postback..and at the time the page postsback, it reloads my dropdownlists, reseting whatever option i had chosen...
what can i do to resolve this?
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Apr 28, 2010
I am generating an html flow into Update Panels in a content ASPX page (VB.Net 2008 Professional w/ SP1). These include EDIT anchor tags that call a javascript function which calls __doPostBack(target, args); so I can interact with the code behind. This all works fine except on some of the postbacks the connection with the browser just seems to get closed prematurely and suddenly the webpage displays a directory listing. When debugging it, it only happens sometimes, at different places for the E and D options below but not for the V or AddPost or AddArticle. I am just stepping through E or D and suddenly the web page show a directory listing. (What is that? Is the connection crashing? Is the page suddenly redirecting to the base directory because it crashed?)
[code]....
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Jan 23, 2010
I have a value variable as: Dim Tax As Decimal = total * 0.075
i would like this value be available to sub procedures on the page even after a postback?
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