LoadViewstate Error

[Guest]

Hi,

When I’m trying to switch from Presentation Mode to Author Mode, at that
point a control is loaded in a custom place holder and I’m getting this
error:

SYSTEM_EXCEPTION: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.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. at System.Web.UI.Control.LoadViewStateRecursive(Object
savedState) at System.Web.UI.Control.LoadViewStateRecursive(Object
savedState) at System.Web.UI.Control.AddedControl(Control control, Int32
index) at System.Web.UI.ControlCollection.Add(Control child) at
Com.MphasiS.JetAirways.TravelPortal.Web.CustomPlaceholders.JetTPPHFAQ.CreatePresentationChildControls(BaseModeContainer
presentationContainer) in
c:\inetpub\wwwroot\jettravelportal\customplaceholders\jettpphfaq.cs:line 79

Code for Authoring and Presentation Mode is:

protected override void CreateAuthoringChildControls(BaseModeContainer
authoringContainer)
{
try
{
authorisationGrid
=(UCFAQ)Page.LoadControl("../UserControls/UCFAQ.ascx");


authoringContainer.Controls.Add(authorisationGrid );

}

catch(System.Exception sysEx)
{
//catch code
}
}

protected override void CreatePresentationChildControls(BaseModeContainer
presentationContainer)
{
try
{
postingNav =(UCFAQPostingNav)
Page.LoadControl("../UserControls/UCFAQPostingNav.ascx");


presentationContainer.Controls.Add(postingNav);

presentationGrid =(UCFAQsSummary)
Page.LoadControl("../UserControls/UCFAQsSummary.ascx");


presentationContainer.Controls.Add(presentationGrid);

}
catch(System.Exception sysEx)
{
//catch code
}
}

Actually, in my module, in both the modes, i.e. Authoring and Presentation,
the way in which we are presenting data is different. So when I’m trying to
switch from Presentation to Authoring mode or vise-versa, it is throwing an
exception.

How can I solve it, please advice.

Thanks,
Pooja.

 

[S. Justin Gengo]

Pooja,

If you add a control dynamically you need to add it again on post back.

I have a a couple of short samples of dynamically adding controls to a page
on my site, www.aboutfortunate.com, click the "Code Library" link at the top
of the page and then type into the search box there "Dynamic Control" and
you'll see the samples.

--
Sincerely,

S. Justin Gengo, MCP
Web Developer / Programmer

www.aboutfortunate.com

"Out of chaos comes order."
Nietzsche

 

[Guest]

Load the control again in the postback and if you dynamically add a control
also give it an ID. If you don't give the control an ID you can get troubles
handling page events on the control.

 

[Guest]

Hi,

Thnx for the replies.

I tried the way both of u have explained in your mails. I tried loading all
the controls at all times and then making them visible / invisible according
to the requirement. But i was still getting the same error.

Disabling the viewstate of the controls helped me but then the problem is -
i have a grid control in one of the user controls that is being loaded. if i
disable the viewstate, the Grid_ItemCommand stops firing when i click on the
"Edit" and "Delete" buttons. Is there a workaround for that.

Thnx,
Pooja.