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

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I am using Ajax Color Picker Control.when i try to run the page.i am getting this error.
Please help..
Thanks in advance.

Here is Code:

XML

<asp:Content ID="ColorContent" ContentPlaceHolderID="MainContentPlaceHolder" runat="server">
    <script type="text/javascript">
        $(document).ready(function () {
            registerDialogBox();
        });
        function colorChanged(sender) {
            sender.get_element().blur();
            sender.get_element().style.color = '#FF3300';
            // + sender.get_selectedColor();
            sender.get_element().style.backgroundColor = '#' + sender.get_selectedColor();
        }
    </script>

XML

<div class="tutor_details">
                          <h1>
                              Color Details</h1>
                          <div class="td_div" style="height: 170px;">
                              <div class="grid">
                                  <label>
                                      Manufactorer</label>
                                  <asp:DropDownList ID="ddlManufactorer" runat="server" CssClass="input_2" AutoPostBack="true"
                                      OnSelectedIndexChanged="ddlManufactorer_SelectedIndexChanged" />
                              </div>
                              <div class="clr">
                              </div>
                              <div class="grid">
                                  <label>
                                      Product</label>
                                  <asp:DropDownList ID="ddlProduct" runat="server" CssClass="input_2" />
                              </div>
                              <div class="clr">
                              </div>
                              <div class="grid">
                                  <label>
                                      Color</label>
                                  <asp:ColorPickerExtender ID="ColorPickerExtender1" TargetControlID="txtcolor" OnClientColorSelectionChanged="colorChanged" runat="server">
                                  </asp:ColorPickerExtender>
                                  <asp:TextBox ID="txtcolor" runat="server" Height="29px" Width="144px" />
                              </div>
                              <div class="clr">
                              </div>
                              <div class="grid padding_top">
                                  <table width="100%" border="0" cellspacing="0" cellpadding="0" style="width: 98%">
                                      <tr>
                                          <td align="right" valign="top">
                                              <div style="float: right;">
                                                  <asp:Button ID="Button_save" runat="server" Text="Save" CssClass="blue_btn" Width="60px"
                                                      OnClick="Button_save_Click" />
                                                  <asp:Button ID="btn_Cancel" OnClientClick="closeDialog();" runat="server" Text="Cancel"
                                                      CssClass="blue_btn" Width="60px" OnClick="btn_Cancel_Click" />
                                              </div>
                                          </td>
                                      </tr>
                                  </table>
                              </div>
                          </div>
                      </div>

VB

[HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).]
   System.Web.UI.ControlCollection.Add(Control child) +9601391
   AjaxControlToolkit.ScriptObjectBuilder.RegisterCssReferences(Control control) in f:\TeamCity\buildAgent\work\80acd78aa4c25314\Server\AjaxControlToolkit\ExtenderBase\ScriptObjectBuilder.cs:323
   AjaxControlToolkit.ExtenderControlBase.OnLoad(EventArgs e) in f:\TeamCity\buildAgent\work\80acd78aa4c25314\Server\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:305
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

Posted 17-Jul-13 0:31am

RahulRana723

Updated 17-Jul-13 1:19am

v3

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Naz_Firdouse · Accepted Answer · 2013-07-17T00:49:00

Solution 1

since you did not posted your code, we cant exactly tell where you need to make changes
You need to use <# instead of <= in your page
Have a look at these to solve your issue

Link1[^]

Link2[^]

Link3[^]

Link4[^]

Posted 17-Jul-13 0:49am

Naz_Firdouse

Comments

RahulRana723 17-Jul-13 6:51am

thanks for reply

RahulRana723 17-Jul-13 6:51am

if i remove my ajax colorpicker control then all are working fine

Naz_Firdouse 17-Jul-13 6:55am

somewhere in your color or the functions it calls, you may be using <=. so replace it with <#

Mark as answer and vote up if it helps you

RahulRana723 17-Jul-13 7:01am

no sir,i have check my all code..

RahulRana723 17-Jul-13 9:12am

Thanks sir you are right.

Member 12485977 12-Sep-17 10:48am

Thanks!!!

Naz_Firdouse 17-Jul-13 7:09am

can you post your code here?
Use improve Question link and post your code