Cannot use RequiredFieldValidator for CheckBoxList within datalist

I have a problem on using RequiredField Validator for CheckBoxList inside Datalist. I am using checkboxlist for poll options. I want the user to answer required poll questions. If user doesn't answer, I want to show an error message. Can anyone please help me to do this?

Here is my design:

     <div id="divPollDataList">
     <asp:DataList ID="PollDataList" runat="server" 
                 <asp:HiddenField ID="PollIDReqHiddenField" Value='<%# Eval("PollID") %>' runat="server" Visible="false" />
                 <asp:Label ID="lblReqQuestionNumber" runat="server" Text='<%# Eval("No of PollQuestion") %>' Font-Bold="true"></asp:Label>
                <asp:Label ID="lblRequiredPollQusetion" runat="server" Text='<%# Eval("PollQuestions") %>' Font-Bold="true"></asp:Label>
                <asp:HiddenField ID="HiddenFieldPollOption" runat="server" Value='<%# Eval("PollOptions") %>' Visible="false" />
                <asp:HiddenField ID="HiddenFieldPollType" runat="server" Value='<%# Eval("PollType") %>' Visible="false"/>
               <asp:RequiredFieldValidator ID="RequiredFieldValidatorReqPoll" runat="server"  CausesValidation="true" ControlToValidate="CheckBoxListMultiple"  Display="Dynamic" ErrorMessage="You must provide the feedback" ></asp:RequiredFieldValidator>
                  <asp:CheckBoxList ID="CheckBoxListMultiple" runat="server" ></asp:CheckBoxList>

       <asp:Button ID="btnSubmitPoll" runat="server" CausesValidation="true" Text="Submit"  OnClick="btnSubmitPoll_click"  />   


    <asp:Button ID="btnBindData" runat="server" Text="Bind" 
        onclick="btnBindData_Click" />

Here is my code:

   protected void PollDataList_ItemDataBound(object sender, DataListItemEventArgs e)
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            System.Data.DataRowView drv = (System.Data.DataRowView)(e.Item.DataItem);

            string strPollID = drv.Row["PollID"].ToString();
            string pollOptions = drv.Row["PollOptions"].ToString();
            string strPollType = drv.Row["PollType"].ToString();
            string strPollRequiredorNot = drv.Row["RequiredPoll"].ToString();

                CheckBoxList chkList = (CheckBoxList)e.Item.FindControl("CheckBoxListMultiple");
                foreach (string opt in pollOptions.Split('}'))
                var validator = (RequiredFieldValidator)e.Item.FindControl("RequiredFieldValidatorReqPoll");
                validator.Enabled = true;


You can read this article it's very interessant about Validator and CheckBoxList.

You can develop custom validator

public class RequiredFieldValidatorForCheckBoxList : BaseValidator

RadioButtonList can be validated , but not CheckBoxList

Link :

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