Коллекция элементов управления не может быть изменена, поскольку элемент управления содержит блоки кода (например, <% ... %и GT;).

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Я использую

NumericUpDownExtender

ajax tool kit мне приходит следующее сообщение

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

не могли бы вы подтолкнуть свою помощь, чтобы избежать этой ошибки

Что я уже пробовал:

<%@ Page Title="" Language="C#" MasterPageFile="~/User.Master" AutoEventWireup="true" CodeBehind="ProductView.aspx.cs" Inherits="Mypro.ProductViews" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server"></asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

    <div class="container">
          <div style="padding-top: 20px">
        <div class="col-md-4 pull-right ">
            <div  class="thumbnail" style="max-width: 480px">
                <div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
                    <!-- Indicators -->
                    <ol class="carousel-indicators">
                        <li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
                        <li data-target="#carousel-example-generic" data-slide-to="1"></li>
                        <li data-target="#carousel-example-generic" data-slide-to="2"></li>
                        
                    </ol>

                    <!-- Wrapper for slides -->
                    <div class="carousel-inner" role="listbox">
                        <asp:Repeater ID="rptrImages" runat="server">
                            <ItemTemplate>
                                <div class="item <%# GetActiveClass(Container.ItemIndex) %>">
                                    <img  src="Images/ProductImages/<%#Eval("PID") %>/<%#Eval("Name") %><%#Eval("Extention") %>" alt="<%#Eval("Name") %>" onerror="this.src='images/noimage.jpg'" class="img-responsive ">
                                </div>
                            </ItemTemplate>
                        </asp:Repeater>
                    </div>
                    <!-- Controls -->
                    <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
                        <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
                        <span class="sr-only">Previous</span>
                    </a>
                    <a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
                        <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
                        <span class="sr-only">Next</span>
                    </a>
                </div>
            </div>
        </div>
        <div class="col-md-4 right pull-right text-center">
            <asp:Repeater ID="RptrProductDetails"  OnItemDataBound="RptrProductDetails_ItemDataBound" OnItemCommand="RptrProductDetails_ItemCommand" runat="server" >
                <ItemTemplate >
                    <div class="divDet1 text-center ">
                        <h1 class="proNameView" style="  font-family: 'El Messiri', sans-serif;"><%#Eval("PName") %></h1>
                            <div class="proPrice"><span style="color:navy">جم</span><span>  </span><span class="proPrice"><%#Eval("PPriceA") %></span>  </div>
                        <p class="proPriceView"><asp:Label ID="LblSellPrice" runat="server" Text='<%#Eval("PPrice") %>'  CssClass="proPriceView" Visible="false"></asp:Label></p>
                            <div class="proPrice"><span class="proOgPrice"><%#Eval("PSelPriceAS") %></span>  </div>
                        <div style="margin-bottom:10px"><span class="label label-danger" style="font-size:80%;color:white"><%#Eval("DiscAmount") %><span>% OFF</span></span></div>
                       <div ><span >الكميه المتاحه</span><span  class=" label label-info"> <asp:Label ID="Lblquantity" runat="server" Text='<%#Eval("Minquantity") %>' ></asp:Label></span><span>  </span><span><asp:Label ID="LblUnit" runat="server"  Text='<%#Eval("UnitName") %>'></asp:Label></span></div>

                    </div>
                    
                    <div class="divDet1  text-center">
                         <span style="font-size:18px;font-weight:bold">الكمية المطلوبه</span>
                         </div>
                    
                        <div runat="server" >
                              <asp:TextBox ID="txtQuantity"  runat="server" Width="50px" CssClass="text-center" Text="0"   type="number"  min="0" MaxLength="100" step="1"></asp:TextBox>
                            <ajaxToolkit:NumericUpDownExtender ID="NumericUpDownExtender1" runat="server" Minimum="1" Maximum="100"  Step="1" TargetControlID="txtQuantity"/>
                        </div>
                         <div class="divDet1  text-center ">
                          <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="من فضلك ادخل الكميه" ControlToValidate="txtQuantity" EnableClientScript="true" ForeColor="Red" ></asp:RequiredFieldValidator>
                            <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ErrorMessage="ارقام فقط" ControlToValidate="txtQuantity" ValidationExpression="^[0-9]*$" ForeColor="Red"></asp:RegularExpressionValidator>
                         </div>
                    <div>
                        
                    </div>
                    <div class="divDet1  text-center ">
                        <asp:Label ID="lblError" runat="server" CssClass="text-danger"></asp:Label>
                    </div>
                    <div class="divDet1 text-center">
                        <h5 class="h5Size">وصف المنتج</h5>
                        <p>
                            <%#Eval("PDescription") %>
                        </p>
   
                    </div>
                     <div>
                        <h5 class="h5Size lead text-center">التوصيل</h5>
                        <div>
                        <div class="text-center"><span class="label  label-warning" style="font-size:80%;color:white"><%#Eval("DeliveryName") %></span></div>
       <hr />
                           <div><span > لطلبات الجمله </span><sapn><span> </span><span style="color:purple;font-size:18px">01550155665 </span></sapn></div>
                            
                    </div>

                    <div class="divDet1 text-center">
                    <asp:Button ID="BtnAddToCart"  CssClass="mainButton" runat="server" Text="اضف الى مشترياتى"  OnClick="BtnAddToCart_Click"  />

                        <asp:Label ID="Label1" runat="server" CssClass="text-danger"></asp:Label>
                    </div>
                   
                    <asp:HiddenField ID="hfCatID" Value='<%# Eval("PcategoryID") %>' runat="server" />
                    <asp:HiddenField ID="hfSubCatID" Value='<%# Eval("PSubCatID") %>' runat="server" />
                    <asp:HiddenField ID="hfBrandID" Value='<%# Eval("PBrandID") %>' runat="server" />
                </ItemTemplate>
            </asp:Repeater>
        
    </div>
          
  
                    <asp:Label ID="Lblmessage" runat="server"  CssClass=" control-label text-center Bold_Icon" ForeColor="#FF3300" ></asp:Label>
                   
           </div>
    </div>
     
</asp:Content>

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