Forms Data Controls :: FormView/GridView Back And Forth Causes "Failed To Load Viewstate"?
Jun 12, 2010
I have a FormView and a GridView connected to the same datasource inside of a MultiView where one view is for the grid and the other for the form. The GridView has selection enabled and when the user selects a record in the GridView I make sure that the same record is selected in the FormView.mv.ActiveViewIndex = vIndexForm; // causes the MultiView to change views from the grid to the form
fv.PageIndex = gv.SelectedIndex + (gv.PageIndex * gv.PageSize); // causes the FormView to use the same selected record as the GridView
This should cause a PageIndexChanged event (it doesn't), so I called by event handler explicitly. In the event handler I change the mode to FormViewMode.Edit. This should cause a ModeChanged event (again it doesn't), so again I called it explicitly.Finally in the ModeChanged event I get the DataItem for the FormView so that I can update some special fields that require some special formatting, however fv.DataItem is null which means I can't do any special formatting. At this point the FormView shows and the regular fields are fine. If I now hit the Cancel button the FormView fires the ChangedMode event at which point I changed the MultiView's ActiveViewIndex back to the view with the grid. The grid displayes just fine, but if I do a select of a row within the GridView again I get the "Failed to load viewstate" error.I can only assume that I'm either doing something in the wrong order or at the wrong time and it's tripping me up.
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Apr 5, 2010
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
The above error occurs with gridview control , when used with template field columns with item template / and edit templates etc.
updating a row within gridview, at the time of loadiong it loads perfectly fined, but when tried to modify an existing row within gridview control, then it produces the error. Make sure the grid view control has to be a child control which manages the child table info with in a master form. to reproduce the above problem the grid view must be loading the child records info of a master within the masterform, meaning both master data and gridview data all to be managed in one single form.
I had to replace gridview control with datagrid and then it worked perfectly fine. I wasted almost 4 days of my time., there is no way we could figure out the problem. here is the full info of the problem.
Server Error in '/' Application.
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
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.Web.HttpException: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
Source Error:
[Code]....
Stack Trace:
[HttpException (0x80004005): Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.] System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +306 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Control.LoadChildViewStateByIndex(ArrayList childState) +134 System.Web.UI.Control.LoadViewStateRecursive(Object savedState) +221 System.Web.UI.Page.LoadAllState() +312 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1661
Version Information: Microsoft .NET Framework Version:2.0.50727.3603; ASP.NET Version:2.0.50727.3082
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Mar 2, 2010
I'm developing a custom webcontrol from GridView.
I've run into this bizarre situation wherein I get the below error if I set page size other than 5 in the page using this control.
"Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request."
This GridView is a hierarchial type. I add a new GridView below each row in the webcontrol overriding OnRowDataBound.
If I set pagesize as 5 the paging works properly.
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Apr 22, 2010
I have gridview control. visit [URL] but when i change page index of this i get error the following error
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
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Oct 9, 2010
Now here is the weird thing. First i am running it locally on the built in vs2008 web server.I load my control in fine, do a postback from a linkbutton, locally on my machine it all works fine, no issue.However when it goes onto my host, it falls over with the message:
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.Now i also load controls dynamically and use postbacks and things in the admin area of the site...and that works fine, however my front end just keeps failing? See the code behing below:
[Code]....
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May 23, 2010
I am writing a search results page for an airline booking system. I have Next/Previous buttons to view flights for the next or previous days. The way i have done my results grid is that i use an HtmlTable and dynamically add rows, cells and controls into the cells. This gives ultimate flexibility given that we can add any control type we want and have it function as it does everywhere else in the system. As you should be aware - i must recreate these controls each time the page is reloaded (in the page_init event) since asp does not handle this automatically.
When they go next/previous it refreshes the flight data and re-populates the grids. If they select a flight in the return grid (by checking the RadioButton), and go next on the FIRST leg grid, the selection of the return leg stays the same after the postback
- which is great. But the problem is, if the flight they selected on the return leg is no longer available it will not create the control and i get the following error;
"Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request."
Is there any way to tell asp.net that if you do not find the control anymore, simply ignore it rather than throwing the error? The nature of this design is that there potentioally WILL be a different layout after the page is posted back.
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Apr 29, 2010
Yes, it's the infamous viewstate again! Now I am aware that problems can ocurr if you load controls in the wrong order or if the viewstate IDs are incorrect after postbacks etc etc. But my issue is that I am not really creating any controls dynamically - I only have one user control on the page.
More importantly, the issue seems to be occuring with just one user. What could be the problem? Corrupt browser cache?
ok - so I've narrowed it down a bit more. When I select an item from a drop down list control (which is a UserControl) - and then attempt to rebind my grid using the selected value, the error occurs.
The selectedvalue on postback seems to be zero every time (because the control is not in the viewstate somehow?!). The UserControl (containing the dropdownlist) is added at design-time.
[Code]....
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Mar 16, 2011
My app is an ASP.NET 2.0 website. I use UpdatePanel to contain all UserControls. I also use ReportViewer control (local mode) for report function. When user click on "View Report" button, a javascript will be executed to open a new window which contains the ReportViewer control. Everything works well in my pc (Windows XP, IIS 5.1).
However, when I deploy the code to app server (Windows 2k3, IIS 6), I encounter a critical issue. After the report window is opened, whenever I click a button or change value of a DropDownList (UpdatePanel will be reloaded after these actions), an exception "Failed to load viewstate" is thrown.
I've tried to update the Report Viewer Redistributable 2005
(http://www.microsoft.com/downloads/en/details.aspx?FamilyID=e7d661ba-dc95-4eb3-8916-3e31340ddc2c) in the server to SP1 (assembly version: 8.0.50727.817),
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Jun 25, 2010
I read you can set matching keys in web.config files across a cluster.
But does it have to match across all the seperate apps on the cluster or is it in pairs?
IE... app1 on both clustered servers match or all apps on both servers have the same key?
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Jan 14, 2011
I have a sample page called Redirect.aspx with following content;
<body onload="document.forms.container.submit()">
<form id="container" runat="server" method="post" name="container">
<input type="hidden" value="<%=Request["APP_ID"]%>" name="APP_ID" />
</form>
</body>
the Page_Load method is following:
protected void Page_Load(object sender, EventArgs e)
{
container.Action = Configuration.Instance.PageToRedirect;
}
To this Redirect.aspx page, I'm directed from some external page. In the request context, I have APP_ID key, which is passed from this external page. Next, I want to pass this APP_ID value using POST to some other page, which is defined in the configuration. Unfortunately, I'm getting such error while redirecting:
Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.
I don't want to disable view state validation (<pages enableViewStateMac="false">) because this is not the "solution" I want to apply.
Besides I don't understand why I'm getting such an error. Can someone get me through this ? Is there any other way to automatically submit a form on Page_Load event ?
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Mar 8, 2011
I'm getting the old "Validation of viewstate MAC failed" error when I click the submit button on my form. (Seehttp://blogs.msdn.com/b/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx) The thing is I'm getting the error even when the page is completely loaded (it can be sitting there for five minutes before I hit submit but I still get the error). This isn't even a particularly lengthy page (which is one of the preconditions). It uses a DetailsView (which I understand is another precondition for this error), but it's the only databound control on the page. Also, whenever users get this error (which is 100% of the time when they click Submit), they lose their login authentication and have to log back in. This page/site has been in use for about six months but the error suddenly started a few weeks ago without any changes being made to the code.
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Oct 7, 2010
I was able to get the formview bound to the objectdatasource, it works great for the first record, but when i select the next record it gives me error below is all my code, if there is something else that i need to post .
[Code]....
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Jan 9, 2011
I have just downloaded Obout.com suite controls for ASP.NET 3.5 and 4.0. I made this because I wanted a DropDown with images near items.It is working well, but, still in the examples, when you set AutoPostBack property to true, and you select an item from the ComboBox controls you get the following error:"Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request."
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Dec 21, 2010
In my master.page I load a Web form:
<script type="text/jscript">$("#LoginInformation").load("LoginInformation.aspx");</script>
But when I have a ListView or DataView, etc... with a pager, I get problems when I click on 'next page'.Then I get the error: Validation of viewstate MAC failed. When I don't use Jquery's load function, I don't get an error.
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Jun 30, 2010
I have a problem regarding to asp.net lifecylce hierarchy.
Basically, I have one user control which has a GridView in it. And this GridView is dynamically generated based on a public property on the control (named Parameter in the simplified code below).
Everything is fine when I insert this control in an aspx page, set its Parameter property and call DataBind(Parameter) on it. GridView is generated and populated on the UI.
Problem occurs when I post-back the page. I have to regenerate the GridView structure so that the data in the ViewState of the control can be used to populate the GridView. So that I can achieve its content. But as long as the GridView structure is generated dynamically and it is based on the Parameter property set on it, this is not possible. Because the OnInit of the user control is called before the OnInit of the page and that is why the Parameter property is set after the generation of the GridView structure. As a result I get an empty Gridview in the end.
Here is the code in a simplified way.
Can you give me some recommendation how to overcome this?
Can I explicitly force asp.NET to re-load the ViewState of a gridview?
[code]....
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Aug 3, 2010
I have a text box inside a update panel. With the onTextChanged events, I have a post back set in "True" to show the customer Name and email when I type in the customer ID in the text box. I want to have it show when we leave or Tab out of the text box. Now is working , but only afte I click the submit button. Does anyone know how to code the following in order to make it work right away when we Tab out of the text box.
protected void txtBDID_TextChanged(object sender,
EventArgs e)
{
}
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Nov 4, 2010
There is a page having formview with inserttemplate loading after user authentication. I have created user id = guest. If anyone login with guest i want to be load page FormView with EmptyDataTemplate.
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Mar 31, 2010
I have a gridview bound to a sqldatasource with editing enabled. If I click Edit, then either Cancel or Update, the update or cancel occurs and the Edit button reappears. However, I cannot then click the browser's back button without having the Update and Cancel buttons reappear. A second click of the back button takes me to a state where the Edit button shows again, *then* another back button click will take me to the referring page (the one before the one with the gridview on it.) IOW, it looks like the postbacks are cached. How can I prevent this and have the back button go straight to the referring page?
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Dec 14, 2010
Currently using VS 2005 & MS SQL 2005 Server with a Windows 7 OS and I am unable to generate Update/Insert/Delete queries when using the TableAdapter wizard. I am able to create the Select statament. This is the error message that is displayed in the TableAdapter wizard on completion for each of the Update/Insert/Delete queries "failed to find or load the registered .net framework data provider"
I have seached the web but no one seems to have seen this same issue.
If you know what is causing this let me know. I didn't have this issue while running a XP or Vista OS.
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Feb 8, 2011
I need to Check a formview for records on page load and if empty, I need to set it to edit mode.
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Apr 13, 2010
I a formview object. I have created an edit temple and an empty template Whehn there is data in the table nor probem When my table is empty i got the empty template to display when I click insert I get the error " Form must be in insert mode" How can I tell if there is no data on the page load so I can maybe do this:
formview.f1.defaultmode = fornviewmode.insert
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Sep 19, 2010
I was searching for my problem for last couple of days. But coudn't find a better solution. So here I go again. What I did which worked great: I was going to a asp page with pre populated Dataset (dataset is already loaded with data), for a GridView. If I do the following .... the GridView shows all the data (with the fields Dataset comes with).
[Code]....
Now what I am trying to do: I am trying to do exact same thing but instead of using GridView, I would like to display data in a FormView. So now I tried to do this
[Code]....
PROBLEM: I can see the FormView Header with text "Test Dataset With FormView" and below the Header it displays the page numbers. I know that I have 3 data in the data set and I can see 3 page link in the FormView. But PROBLEM is it doesn't display any Field / Data. Not sure why it is doing this
Note that I wouldn't know what field to display in the FormView. Whatever I have in the Dataset I need to display. Is there any work around to accomlish my work (maybe by not using a FormView, but other conrol ?). My original goal is to Display Data in a Form View Format (One data at a time
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Mar 24, 2010
I have a GridView and a FormView on the same page. They both have separate DataSources. This is a simple Master Details configuration, when a someone clicks on the Select link in the GridView, the FormView brings up the Details data. But for some reason the FormView's DataSource is trying to retrieve data when I load the page. This is causing an error because no ID is passed from the GridView.
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Jan 29, 2011
I have no problem when paging my FormView, the dropdownlist does not read the next record and keep the value of the first loaded record? All other textbox control behave normally and move from record to record excepted the ddl??Here the code.
Public Sub DoData()
Dim myConn As SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("LocalSqlServer").ConnectionString)
Dim myCommand As SqlCommand = New SqlCommand("SelectSupplier", myConn)
myCommand.CommandText = "SelectSupplier"
[Code]....
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May 4, 2010
I have a FormView with an EditTemplate.And the EditTemplate contains an ascx control:
<asp:FormView
ID="fvTicketUpdate"
runat="server"
[code]...
The contents of the ascx control has TextBox and DropDownList controls binding to the results of the FormView's ObjectDataSource through Text='<%# Eval("field1") %>'and SelectedValue='<%# Eval("field2") %>'.This works fine and I have been building all of my front end pieces like this as <asp:Panels> rendering as FieldSets that go 100% across the screen.And we call these areas "strips" accross the screen.But now I've run into a problem.One TextBox and one DropDown bind fine to a Ticket Object.But the DropDownList that works has its <asp:ListItems> hardcoded before hand.Now I have DropDownList that gets populated through a WebService in the ascx's
code behind like this:
public partial class UserControls_FormControls_PntipUpdtFaaInfo :
System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
[code]...
The Problem I think is the FormView is trying to do its Bind to the objectDataSource before its child ascx control is loaded in the Edit Template.And I am getting this error:
Databinding methods such as Eval(),XPath(),and Bind() can only be used in the context of a databound control.Meaning that the control must already be databound to bind the selectedValue to a Property of the TicketObject.Is there an easy way to force the order of loading to make the PntipUpdtFaaInfo control load and have its Page_Load execute and bind ddlEquip before the FormView does its first dataBind and executing its Evals?Otherwise I have to take out the eval on the ddlEquip SelectedValue attribute and go to the Parent Page and hack and force everything to happen when it needs to.This layout has worked out well for me.All of the ascx area strips across the screen share the same Validation Summary for example.It allows me to think about one section at a time and the Properties to the Business Obect and CRUD methods as I go.But this is a big brick wall I've hit.
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