Solved

InputBox causes ViewState Validation failure

Posted on 2008-10-02
2
250 Views
Last Modified: 2013-11-07
I am getting an error in my VB code: "Validation of viewstate MAC failed".  Note that I am NOT using a cluster environment, the viewstate mac failure seems to be a "catchall" error message for Microsoft, so the error message has no helpful information.

To see the error goto: http://www.thedesk.info/myplan/printerFriendlyTop2.aspx?domain=community&pageToPrint=print.aspx
then click "Email".  All of the other options work.

I have determined that by removing a call to InputBox, the error goes away.  Also, the error states that I can get more information by making debug="true", but it is both globally and in the page.

Does anyone know why a call to InputBox would cause this error and how I can get around it?  My web.config is as follows:

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- Web.Config Configuration File -->

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
    <system.web>
        <customErrors mode="Off"/>
                        <pages validateRequest="false" enableEventValidation="false" viewStateEncryptionMode ="Never" />
        <compilation debug="true"/>
          </system.web>
</configuration>
<%@ Page Language="VB"%>
<script language="VB" runat="Server">
 
...
 
  Sub SendEmail(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim email As String = InputBox("Please enter your email address")
    Dim pageToLoad As String = "print.aspx?domain=" & domain.Value & "&userName=" & userName.Value
    Dim tx As New System.IO.StringWriter
    Server.Execute(pageToLoad, tx)
	  
    Dim ct As System.Net.Mime.ContentType = New System.Net.Mime.ContentType(System.Net.Mime.MediaTypeNames.Text.Html)
    Dim plan As Net.Mail.Attachment = Net.Mail.Attachment.CreateAttachmentFromString(tx.ToString(), ct)
    plan.ContentDisposition.FileName = "myplan_" & domain.Value & ".html"
    plan.ContentDisposition.DispositionType = System.Net.Mime.MediaTypeNames.Text.Html
		
    Dim msg As String = "Your plan is attached"
    GeneralFunctionsVB.mail(email, "MyPlan", "myplan@thedesk.info", msg, Nothing, Nothing, 0, plan)
  End Sub
</script>
 
...
 
<!-- The .NET code for handling the Email link -->
<asp:LinkButton ID="EmailLink" runat="server" CssClass="actionLink" OnClick="SendEmail">Email...</asp:LinkButton>

Open in new window

0
Comment
Question by:dageyra
2 Comments
 
LVL 15

Accepted Solution

by:
NazoUK earned 500 total points
ID: 22628635
You can't use InputBox in an asp.net page, how would it work?
Put a textbox on your page, if necessary to have it as a pop-up you'll need to do it with javascript or the modalpopupextender from the ajax toolkit or something similar.
0
 
LVL 1

Author Comment

by:dageyra
ID: 22672632
HI:

I wanted to let you know that I worked it out with JavaScript, you were right, the InputBox would not work--though I am still confused as to why it generates a "ViewState" failure.  
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Lync server 2013 or Skype for business Backup Service Error ID 4049 – After File Share Migration
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question