Forms Data Controls :: Failed To Load Viewstate When Gridview Control

Forms Data Controls :: GridView CustomWebControl Error For PageSizes Other Than 5/Failed To Load Viewstate

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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Forms Data Controls :: Error On Page Index Change In Gridview / Failed To Load Viewstate

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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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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State Management :: Failed To Load Viewstate. The Control Tree Into Which Viewstate Is Being Loaded Must Match ?

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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Data Controls :: How To Replace GridView With ListView Control

May 7, 2015

protected void Page_Load(object sender, EventArgs e)
{
if (this.Page.PreviousPage != null)
{
int typeId = int.Parse(Request.QueryString["TypeId"]);

[Code]..

I want it in gantai gridvew into the ListView.

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How To Replace DATAGRID With GRIDVIEW On WEBFORM1

Jul 28, 2010

I am using ASPNET2008 I have been asked to replace DATAGRID with GRIDVIEW on WEBFORM1.ASPX.

For Pagination, I am having problem due to lack of knowledge to replace page 1,2,3,4,5,6,7 8, 0 with NEXT , PREV like I did it for DATAGRID. Have to use NEXT and PREV because the GRIDVIEW Pagesize = 20 while the rows from the TBLSALESTRANSACTION exceeded 350rows What I am trying to do is, each time the user click on either NEXT or PREV, This is what I want the GIRDVIEW to display. NEXT the GRIDView should display the next 20 rows and the LBLPAGE.text should display the page number of the current 20 rows, Eg. Page : 2 / 18 PREV the GRIDView should display the previous 20 rows from the current 20 row and the LBLPage.text should display the page number of the current rows, Eg. 1 /18.

Also, How do I determine logically whether it NEXT or PREV being clicked ? And how do I use this FLoadGridView to either display next 20 or previous 20 rows.

[Code]....

[Code]....

[Code]....

[Code]....

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State Management :: Dynamically Added Controls And 'Failed To Load Viewstate' Error

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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Forms Data Controls :: Error When Trying To Render Datagrid In Email.Control 'GridView1' Of Type 'GridView?

Aug 9, 2010

I can't figure out what I"m doing wrong.. I followed this sample online at
http://www.4guysfromrolla.com/articles/091102-1.aspx to include a gridview in an email. But, it keeps throwing this error.. 'GridView' must be placed inside a form tag with runat=server.I've verified that the gridview is in a form, and there are no template fields in the gridview. Heres the gridview on my asp.net page..

[Code]....

[Code]....

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Forms Data Controls :: Gridview Sorting Failed If Multiple Gridview Are Created

Mar 10, 2011

I got a web page, it has a tabcontainer, within each tab, there will be a gridview, all the tabs and gridview are created at run-time, i have only one code, that I will loop through to create all those tabs and gridview. When I apply the sorting, and I click on the column name on any grid, it returned an error saying index was out of bound. BUT, when there is only ONE grid view created, it is working fine, I suspect it mixed up all the grid view's id and so on. But I have assigned different ID to gridview

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Failed To Load Viewstate?

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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Gridview - Can Explicitly Force To Re-load The ViewState Data Of Any Data-contro

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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Forms Data Controls :: Cannot Load Image In Gridview Control

Jun 17, 2010

i am trying to load images from the northwind database (categories table) into grid view control. But it does not seems to work.

Default.aspx

[Code]....

[Partial] Default.aspx.cs

[Code]....

[Partial] ImageHandler.ashx

[Code]....

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SQL Reporting :: ReportViewer - Failed To Load Viewstate?

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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State Management :: Error - Failed To Load Viewstate

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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C# - Validation Of Viewstate MAC Failed While Submit A Form On Page Load?

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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Forms Data Controls :: Replace Text In GridView Or Something?

Nov 6, 2010

I have big problem I have a table where the column is "Enabled" datatype = bit.

In this column I have data True / False. The show GridView column 'Enabled'. Problem is, as everywhere in this column, write True / False. How, in view of this information in the GridView displayed: True = Verified, False / UnVerified GridView, column is "Enabled"

Column Enabled:
No False
No True
Column Enabled I want this
Unverified
Verified

It should probably change the text, or something like that.

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Forms Data Controls :: Replace Function In A Gridview?

Jul 26, 2010

I am trying to replace carriage returns from a column in a database (MS access) with the br tag.

This could be easily done in classic ASP with <% = replace(recordsetField , Chr(13),"<br>") %>

Not sure how I would do it with .net (c#)

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Forms Data Controls :: CheckBox In GridView - Replace With Images?

Jun 15, 2010

I am relatively new to asp.net and program using VB. I have written the following code to try and replace ReadOnly CheckBoxes with an image as the CheckBoxes appear grayed out and difficult to see. The GridView is linked to a SQL DataSource to display information only.

The problem I am having is displaying the image for unchecked boxes where the data (PET) in the SQL table is set to 'false'. The code displays the checkbox image fine when the bit is set to 'true', but no image appears in the GridView rows where the bit is 'false'.

[Code]....

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Forms Data Controls :: Replace Figures With Null In Gridview?

Nov 9, 2010

i have a grid view that displays a load of figures, and as there is a lot of zero's in these tables i wondered if it would be possible to just display nothing were there is a "0" ... just to make it look cleaner?

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Forms Data Controls :: Replace 'select' In Gridview With Check Box?

Jun 14, 2010

I have this scenario where i want to select multiple customers at a time and add them to a group/role. to do this i thought of using a gridView and listed them all with sqlDatasource and enabled 'selection' for gridview. but by default grid view is allowing only one selection at a time. so is there a way i can insert a new column of check boxes and some how read the gridview to know which checkboxes are selected? if you know a better approach than a gridview or check box please suggest me. i am not very familiar with asp.net so

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Forms Data Controls :: Access Gridview Column 2 And For Each Row Replace Text

Mar 31, 2011

i want to access gridview collumn 2 and for each row replace the text that is there with a "*" because its a password fields so instead on show the pass hide it with * so its more or less this but... see comment line

[Code]....

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Forms Data Controls :: Viewstate MAC Failed Error -- With A Weird Twist?

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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Forms Data Controls :: How To Replace Values In GridView Returned From A Stored Procedure

Sep 10, 2010

I am working on creating a stored procedure that will output a pivot table. In the pivot table will be either the string NULL or a number. How can I reformat this in ASP.NET so the NULL value becomes a blank cell in the gridview and the number (whatever it is) becomes an 'X' ?

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Forms Data Controls :: Viewstate On Postback With Gridview?

Apr 8, 2010

I've got a GridView on my page which has some bound controls, one of which is a label (to display total price):

[Code]....

However this value is not being passed to my page. All I see is '�' symbol, no price which makes me think Viewstate["youpay"] is empty? I have enabled viewstate on the Page and Control tags.

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Forms Data Controls :: Failed To Load Viewstate When Gridview Control - Replace Gridview With Datagrid