Binding nested datalist in ASP.NET

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C#

ASP.NET

I have nested datalist. Parent datalist displays answers and child datalist displays comments for a particular answer. Suppose there are 2 answers and for 1st answer there are 2 comments "hi","Hello" and for 2nd answer there is 1 comment "Welcome". Then it should display like:
Example:
----------------------------
Answer 1
"hi"
"hello"

Answer 2
"Welcome"
-----------------------------
But it is displaying like:
-----------------------------
Answer 1
"hi"
"hello"
"hi"
"hello"

Answer 2
"Welcome"
"Welcome"
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Below is the code of ASPX and C#
------------------------------------------------------------------
ASPX:
-------------------------

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
                       <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                            <ContentTemplate>
                                <asp:DataList ID="dlAnswers" runat="server" RepeatColumns="1" RepeatDirection="Vertical" OnItemCommand="Datalist_Answer" DataKeyField="Aid" OnItemDataBound="dlAnswers_ItemDataBound" >
                               <ItemTemplate>
                                <div class="comment-body comment-body-answered clearfix">
                           <div class="avatar">
                               <asp:Image ID="ProfileImg" runat="server" ImageUrl='<%#Eval("ProfileImg") %>' />
                           </div>
                           <div class="comment-text">
                               <div class="author clearfix">

                                   <div class="comment-meta">
                                      <span>Author :<a href="#"> <%#Eval("FirstName")+" "+Eval("LastName") %></a></span>

                                       <div class="date"><i class="icon-time"></i>Posted on: <%#Eval("AnsDate") %></div>
                                       <a class="button small green-button" href="#" style="float:right;padding:5px 15px;margin-left:300px;text-align:center;width:130px;font-size:12px;margin-top:-20px">Accept Solution</a>
                                   </div>

                               </div>
                               <br />
                               <div class="clearfix"></div>
                               <div class="text">
                                   <asp:Label ID="lblAnswer" runat="server" Text='<%#Eval("Description")%>'></asp:Label>
                               </div>
                               <br />

                               <div id="AnsCommentBox" class="question-answered question-answered-done">
                                  <asp:DataList ID="dlAnswerComment" runat="server" RepeatDirection="Vertical">
                                      <ItemTemplate>
                                           <ul class="children">
                                           <li class="comment">
                                               <div class="comment-body clearfix">

                                               <div class="comment-text">
                                           <div class="author clearfix">
                                           <div class="comment-author"><a href="#"><%#Eval("FirstName")+" "+ Eval("LastName") %></a></div>
                                           <div class="comment-meta">
                                               <div class="date"><i class="icon-time"></i><%#Eval("AnsCDate") %></div>
                                           </div>

                                       </div>
                                       <div class="text">
                                           <p><asp:Label ID="lblAnsComment" runat="server" Text='<%#Eval("AnsComments")%>'></asp:Label></p>
                                       </div>
                                   </div>
                               </div>

                           </li>
                       </ul>

                       </ItemTemplate>
                       </asp:DataList>
                                  <asp:Button ID="btnComment" runat="server" Text="Have a Comment?" CssClass="button small blue-button" CommandName="GenerateCommentBox" />
                                   <asp:Panel ID="PlComment" runat="server" Visible="false" >
                                       <asp:TextBox ID="txtAnswerComment" runat="server" TextMode="MultiLine" CssClass="noresize"></asp:TextBox>
                                       <asp:Button ID="btnSumbit" runat="server" CssClass="button small blue-button" Text="Submit" Font-Size="12px" CommandName="SubmitComment" />
                                        <asp:Button ID="btnCancel" runat="server" CssClass="button small red-button" Text="Cancel" Font-Size="12px" CommandName="CancelButton"/>
                                   </asp:Panel>

                                  </div>
                           </div>
                       </div>

                          <hr />

                           </ItemTemplate>
                    </asp:DataList>
           </ContentTemplate>
         </asp:UpdatePanel>

----------------------------------------------------------------------
C#
---------------------------------------------------------------------

protected void Page_Load(object sender, EventArgs e)
     {

         if (!IsPostBack)
         {
             LoadAnswers();
         }

     }

     private void LoadAnswers()
     {
         li.QuestionID = Convert.ToInt32(Request.QueryString["qid"]);

         dlSingleQuestion.DataSource = li.Get_Question_By_Id(li);
         dlSingleQuestion.DataBind();

         dlAnswers.DataSource = li.Get_All_Answers(li);
         dlAnswers.DataBind();
     }
     protected void dlAnswers_ItemDataBound(object sender, DataListItemEventArgs e)
     {
          
       DataList dl = (DataList)e.Item.FindControl("dlAnswerComment");
      li.AnswerID =          Convert.ToInt32(dlAnswers.DataKeys[e.Item.ItemIndex].ToString());
                dl.DataSource = li.Get_All_Answer_Comment(li);
                dl.DataBind();         
        }

What I have tried:

Shall I use repeater control or Datalist is OK...