I stripped the code down a little but here it is... There are two classes: 1
regular aspx page "Class1.aspx" and another web control "WebControl.cs" that
is implemented by Class1. Class1 passes several values to WebControl.cs via
the ViewState which also gets changed during the rendering process.
public class Class1 : System.Web.UI.Page
{
protected Controls.WebControl WebCtl;
protected System.Web.UI.WebControls.Repeater ceParamRep;
protected System.Web.UI.HtmlControls.HtmlForm frmDefault;
protected System.Web.UI.WebControls.Label headerlabel;
private void Page_Load(object sender, System.EventArgs e)
{
string passedItem;
WebControl.PassedItem = passedItem;
}
}
public class WebControl : System.Web.UI.WebControls.WebControl,
System.Web.UI.IPostBackDataHandler
{
[Bindable(true),
Category("Item"),
DefaultValue("")]
public string PassedItem
{
get
{
object obj = ViewState["passedItem"];
return (obj == null) ? String.Empty : (string)obj;
}
set
{
ViewState["passedItem"] = value;
}
}
protected override void Render(HtmlTextWriter output)
{
if (Page != null)
{
output.Write(this.PassedItem);
}
}
bool IPostBackDataHandler.LoadPostData(string postDataKey,
NameValueCollection postCollection)
{
bool change = false;
string ssvalue = postCollection[this.SSHelper];
if (ssvalue != null)
{
if(String.Compare(ssvalue,this.PassedItem.ToString(),true) != 0)
{
this.PassedItem = ssvalue;
// If there is a change, raise a change event.
change = true;
}
}
string modevalue = postCollection[this.ModeHelper];
if (modevalue !=null)
{
if(String.Compare(modevalue,this.Mode.ToString(),true) != 0)
{
this.Mode = modevalue;
change = true;
}
}
return change;
}
void IPostBackDataHandler.RaisePostDataChangedEvent()
{
// There was a change, so raise any events.
if (ConfigurationChanged != null)
{
ConfigurationChanged(this, EventArgs.Empty);
}
}
S. Justin Gengo said:
Jamie,
Is it possible for you to post the code or at least the parts of it or an
example that you deem relevant? It's going to be almost impossible to figure
out what's going on without seeing an example.
Thanks,
S. Justin Gengo, MCP
Web Developer / Programmer
www.aboutfortunate.com
"Out of chaos comes order."
Nietzsche
Unfortunately I have already tried setting the EnableViewStateMac
attribute =
"false" and it did not fix the issue. Also, I am not using
Server.Transfer
on the page.
:
Jamie,
See if this helps...
http://www.extremeexperts.com/Net/FAQ/ViewStateisCorrupt.aspx
--
Sincerely,
S. Justin Gengo, MCP
Web Developer / Programmer
www.aboutfortunate.com
"Out of chaos comes order."
Nietzsche
Justin,
See below...
Exception Details: System.Web.HttpException: The viewstate is invalid
for
this page and might be corrupted.
Source Error:
An unhandled exception was generated during the execution of the
current
web
request. Information regarding the origin and location of the exception
can
be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): The viewstate is invalid for this page and
might be corrupted.]
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +139
System.Web.UI.Page.LoadPageViewState() +17
System.Web.UI.Page.ProcessRequestMain() +423
:
Jamie,
What's the exact error being returned?
--
Sincerely,
S. Justin Gengo, MCP
Web Developer / Programmer
www.aboutfortunate.com
"Out of chaos comes order."
Nietzsche
I am receiving an Invalid ViewState error after posting back to the
same
page
twice. Consistently the error occurs after the second postback and
not
after
the first.
I have looked into creating a static machinekey in the
machine.config
and
that did not help. I believe that issue only occurred when there
was
an
inconsistent viewstate error. The error I am faced with
consistently
occurs.
Are there any known problems with the ViewState when posting back to
the
same page multiple times? Any help would be much appreciated.
