textbox inside repeater control

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ASP.NET

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hello , my problem is simple .

it's Questions and answers page about 17 question with it's answer ,
with two text boxes one for question and on for answer.
i bind the questions at the PageLoad from List<> method .
i have a repeater control with one itemtemplate containing the two textboxes.

i loop through the repeater and insert the data in my database , but the problem is the first textbox is the only one inserted !
when i press save button it seems that it takes the binded data for question textbox because when i write into the text without binding it , it behave like it's an empty just like what happening with the Answer text box .




this my code :

 <asp:Repeater ID="questionRepeater" ViewStateMode="Enabled" runat="server">
    <ItemTemplate>
        <tr class="">
            <td>
                <div class="control-group">
                    <label class="control-label">Queston  : </label>

                    <div class="controls">
                        <asp:TextBox runat="server" ID="txtQ" Text='<%#Eval("Question") %>' ReadOnly="true" CssClass="span8">
                        </asp:TextBox>
                    </div>
                </div>
            </td>
        </tr>
        <tr class="info">
            <td>
                <div class="control-group">
                    <label class="control-label">Answer : </label>
                    <div class="controls">
                        <asp:TextBox runat="server" ID="txtAns"
                            Height="150" TextMode="MultiLine" CssClass="span8"></asp:TextBox>

                    </div>
                </div>
            </td>
        </tr>
    </ItemTemplate>
</asp:Repeater>

private void BindRepeater()
   {
       List<SessionQuestion> questions = new List<SessionQuestion>();
       questions.Add(new SessionQuestion { Question = " Q1" });
       questions.Add(new SessionQuestion { Question = " Q2" });
       .
       .
       .
       questionRepeater.DataSource = questions;
       questionRepeater.DataBind();
   }

   protected void btnSave_Click(object sender, EventArgs e)
   {
       Sessions session = new Sessions();
       SessionQuestion sessionQuestions = new SessionQuestion();

       session.ClientId = id;
       session.DateTime = DateTime.Now;
       session.Report = txtReport.Text;
       session.Notes = string.Empty;
       session.IsActive = IsActive.Active;

       int sessionId = SessionBLL.Insert(session);

       foreach (Control item in questionRepeater.Items)
       {
           sessionQuestions.SessionId = sessionId;


           TextBox txtQ = (TextBox)item.FindControl("txtQ");
           sessionQuestions.Answer = "";
           sessionQuestions.Question = txtQ.Text;

           var txtAns = (TextBox)item.FindControl("txtAns") as TextBox;
           if (txtAns != null)
           {
               sessionQuestions.Answer = "";
               sessionQuestions.Answer = txtAns.Text;
           }


           Thread.Sleep(150);
           if (txtAns != null && txtQ.Text != null)
           {
               SessionQuestionBLL.Insert(sessionQuestions);
           }
       }

       string message = "";

       Response.Redirect("/Sessions/Sessions.aspx?message=" + message);
   }