The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>) : ASP.NET

May 9, 2008 06:47pm pdt

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03.27.2008 at 11:43PM PDT, ID: 23276550

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8.4

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

Zones: .Net Editors & IDEs, Visual Studio .NET 2005, .NET Framework 2.0

Tags: ASP.NET

I'm using Visual Studio 2005 to implement ABCUpload progress bar. And I encounter problem when puting the following code with error "The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)."

I have a master content that include the aspx page. Is it work slight difference ...

         
           
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             ASPX PAGE
 
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="progressbar.aspx.vb" Inherits="progressbar" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
 <title>Progress...</title>
  <meta http-equiv="expires" content="Tue, 01 Jan 1981 01:00:00 GMT"/>
  <% = Meta %>
 
  <script type="text/javascript" language="javascript">
  <!--
  if (<% = Percent %> >= 100) top.close();
  //-->
  </script>
</head>
 <body bgcolor="#cccccc">
 
 <table border="0" width="100%">
   <tr>
    <td><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Uploading:</b></font></td>
   </tr>
   <tr bgcolor="#999999">
    <td>
     <table border="0" width="<% = Percent %>%" cellspacing="1" bgcolor="#0033ff">
      <tr><td><font size="1">&nbsp;</font></td></tr>
     </table>
    </td>
   </tr>
   <tr>
    <td>
     <table border="0" width="100%">
      <tr>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1">Estimated&nbsp;Time&nbsp;Left:</font></td>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><% = State %></font>
       </td>
      </tr>
      <tr>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1">Transfer&nbsp;Rate:</font></td>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><% = Kbps %> KB/sec</font></td>
      </tr>
      <tr>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1">Information:</font></td>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><% = Note %></font></td>
      </tr>
      <tr>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1">Uploading&nbsp;File:</font></td>
       <td><font face="Verdana, Arial, Helvetica, sans-serif" size="1"><% = FileName %></font></td>
      </tr>
     </table>
    </td>
   </tr>
   <tr>
   </tr>
  </table>
 
 </body>
 
</html>
 
CODE BEHIND PAGE
Imports WebSupergoo.ABCUpload6
 
Public Class progressbar
    Inherits System.Web.UI.Page
 
    Protected State As String
    Protected Meta As String
    Protected Percent As String
    Protected Kbps As String
    Protected Note As String
    Protected FileName As String
 
    Protected Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim theProgress As Progress = New Progress(Request.QueryString("ProgressID"))
 
        Dim theID As String = theProgress.ID.ToString()
        Dim theMins As String = CInt(theProgress.SecondsLeft / 60).ToString()
        Dim theSecs As String = (CInt(theProgress.SecondsLeft) Mod 60).ToString()
        Meta = "<meta http-equiv=""refresh"" content=""2,progressbar.aspx?ProgressID=" + theID + """>"
        Percent = theProgress.PercentDone.ToString()
        Kbps = Math.Round(theProgress.BytesPerSecondCurrent / 1024, 1).ToString()
        Dim theKbdone As String = Math.Round(CDbl(theProgress.BytesDone) / 1024, 1).ToString()
        Dim theKbtotal As String = Math.Round(CDbl(theProgress.BytesTotal) / 1024, 1).ToString()
        Note = theProgress.Note
        FileName = theProgress.FileName
        If theProgress.Finished = True Then Meta = ""
        State = theMins + " min " + theSecs + " secs (" + theKbdone + " KB of " + theKbtotal + " KB uploaded)"
    End Sub
End Class
 
 
Partial Class progressbar
    Inherits System.Web.UI.Page
 
End Class

           
         

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Question Stats

Zone: Microsoft

Question Asked By: AXISHK

Solution Provided By: avnish_tanna

Participating Experts: 1

Solution Grade: A

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EE Bugs

03.28.2008 at 05:17AM PDT, ID: 21229633

avnish_tanna:

This error occurs because you have <% %> tags in head area...
Add meta tags from code behind, as mentioned below in page_load event:

If this does not work, then try getting your javascript script tag inside body. (because you are using <% tags in that block too.)

         
           
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                     HtmlMeta metaDesc = new HtmlMeta();
        metaDesc.Name = "DESCRIPTION";
        metaDesc.Content = "Meta content";
 
        HtmlMeta metaKeywords = new HtmlMeta();
        metaKeywords.Name = "KEYWORDS";
        metaKeywords.Content = "Your meta keywords";
 
        HtmlMeta metaAuthor = new HtmlMeta();
        metaAuthor.Name = "author";
        metaAuthor.Content = "Meta Author";
 
        HtmlMeta metaRobots = new HtmlMeta();
        metaRobots.Name = "robots";
        metaRobots.Content = "";
 
        HtmlMeta metaLanguage = new HtmlMeta();
        metaLanguage.Name = "language";
        metaLanguage.Content = "en";
 
        HtmlMeta metaCategory = new HtmlMeta();
        metaCategory.Name = "category";
        metaCategory.Content = "";
 
        HtmlMeta metaSearchEngines = new HtmlMeta();
        metaSearchEngines.Name = "search engines";
        metaSearchEngines.Content = "";
 
        //Add Meta controls to HtmlHead
        HtmlHead head = (HtmlHead)Page.Header;
        head.Controls.Add(metaDesc);
        head.Controls.Add(metaKeywords);
        head.Controls.Add(metaAuthor);
        head.Controls.Add(metaRobots);
        head.Controls.Add(metaLanguage);
        head.Controls.Add(metaCategory);
        head.Controls.Add(metaSearchEngines);
        head.Visible = true;

           
         

Open in New Window

03.28.2008 at 07:10AM PDT, ID: 21230507

AXISHK:

The error get rid if I also move the Javacript into Page_Load. However, the result is not what I expect. The file upload progress page always displayed but not progess status is shown even I upload a file. Do I mean the postion / syntax for Javascript wrongly ??

Many thanks

         
           
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             Imports WebSupergoo.ABCUpload6
 
Public Class progressbar
    Inherits System.Web.UI.Page
 
    Protected State As String
    Protected Meta As String
    Protected Percent As String
    Protected Kbps As String
    Protected Note As String
    Protected FileName As String
 
    Protected Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.Load
 
        Dim metadesc As HtmlMeta = New HtmlMeta()
        metadesc.Name = "DESCRIPTION"
        metadesc.Content = "Meta content"
 
        Dim metakeywords As HtmlMeta = New HtmlMeta()
        metakeywords.Name = "KEYWORDS"
        metakeywords.Content = "Your meta keywords"
 
        Dim metaAuthor As HtmlMeta = New HtmlMeta()
        metaAuthor.Name = "author"
        metaAuthor.Content = "Meta Author"
 
        Dim metaRobots As HtmlMeta = New HtmlMeta()
        metaRobots.Name = "robots"
        metaRobots.Content = ""
 
        Dim metaLanguage As HtmlMeta = New HtmlMeta()
        metaLanguage.Name = "language"
        metaLanguage.Content = "en"
 
        Dim metaCategory As New HtmlMeta
 
        metaCategory.Name = "category"
        metaCategory.Content = ""
 
        Dim metaSearchEngines As HtmlMeta = New HtmlMeta
        metaSearchEngines.Name = "search engines"
        metaSearchEngines.Content = ""
 
 
        Dim metaScript As HtmlMeta = New HtmlMeta
        metaScript.Name = "search engines"
        metaSearchEngines.Content = "script type=""text/javascript"" language=""javascript"" " & _
            "  if (<% = Percent %> >= 100) top.close()</script>"
 
        ' //Add Meta controls to HtmlHead
        Dim head As HtmlHead = Page.Header
        head.Controls.Add(metadesc)
        head.Controls.Add(metakeywords)
        head.Controls.Add(metaAuthor)
        head.Controls.Add(metaRobots)
        head.Controls.Add(metaLanguage)
        head.Controls.Add(metaCategory)
        head.Controls.Add(metaSearchEngines)
        head.Controls.Add(metaScript)
        head.Visible = True
 
 
        Dim theProgress As Progress = New Progress(Request.QueryString("ProgressID"))
 
        Dim theID As String = theProgress.ID.ToString()
        Dim theMins As String = CInt(theProgress.SecondsLeft / 60).ToString()
        Dim theSecs As String = (CInt(theProgress.SecondsLeft) Mod 60).ToString()
        Meta = "<meta http-equiv=""refresh"" content=""2,progressbar.aspx?ProgressID=" + theID + """>"
        Percent = theProgress.PercentDone.ToString()
        Kbps = Math.Round(theProgress.BytesPerSecondCurrent / 1024, 1).ToString()
        Dim theKbdone As String = Math.Round(CDbl(theProgress.BytesDone) / 1024, 1).ToString()
        Dim theKbtotal As String = Math.Round(CDbl(theProgress.BytesTotal) / 1024, 1).ToString()
        Note = theProgress.Note
        FileName = theProgress.FileName
        If theProgress.Finished = True Then Meta = ""
        State = theMins + " min " + theSecs + " secs (" + theKbdone + " KB of " + theKbtotal + " KB uploaded)"
    End Sub
End Class
           
         

Open in New Window

03.28.2008 at 08:17AM PDT, ID: 21231175

avnish_tanna:

ya.. You have put script inside meta... you don't need to do so.
just put the javascript inside your aspx page only. but shift it inside body tag. Remove it from code behind. You need to put all the meta related information inside page_load. Don't forget to put .visible=true at the end of it.

Accepted Solution

20080236-EE-VQP-29 / EE_QW_2_20070628