show message for existing data at modalpopupextender box at insert time without closing modalpopupextender ? .

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C#

ASP.NET4

i am using modalpopupextender for insert some data when i am inserting data and if that exists in database then show message in a label on page and modalpopupextender clsed ,but i want to show existing message within same modalpopupextender where i am inserting without closing modalpopupextender box ,plz help me .

my code is -

<asp:Label ID="lblsubjectmassageshow" runat="server" Text="" CssClass="lblsubjectmassage"  Visible="false">
<cc1:modalpopupextender ID="mp1"  runat="server" PopupControlID="popUpPanel" TargetControlID="LinkButton5"
    CancelControlID="btnclose" BackgroundCssClass="modalBackground">

        <asp:Panel ID="popUpPanel" runat="server">
        <div id="loginform" style="border: Solid 3px #123a6b;<br mode=" hold=" /> width: 100%; height: 140px">
                cellpadding="0" cellspacing="0">
        <table>
        <tr>
              <td class="redstar"> </td>
                    <td style="background-color: #123a6b" colspan="1" hold=" />font-weight: bold; font-size: larger">
                        align="center">
                     <span style="color:White"> Add elective group</span>
                    </td>
                </tr>
        <tr>
            <td><span class="txt"><span class="textcolorarkblack">
            <br />
          Name:</span> </span><span class="redstar">*</span></td>
            <td>  <br /><asp:TextBox ID="txtelectivename"  runat="server" placeholder=" Name"
                    Width="186px">
                <asp:RequiredFieldValidator ID="rfvUserName" runat="server"
                    ErrorMessage="Please enter  User Name" ControlToValidate="txtelectivename"
                    Display="Dynamic" ForeColor="Red">
            <asp:RegularExpressionValidator Display = "Dynamic"  ControlToValidate = "txtelectivename" ForeColor="Red"  ID="RegularExpressionValidator1" ValidationExpression = "^[\s\S]{0,50}$" runat="server" ErrorMessage="Maximum 50 characters allowed.">

                    </td>
        </tr>
        
        <tr>
            <td></td>
            
            
            <td><br /><asp:Button ID="btnsubmitelectivegroup" onclick="btnelectivesubmit" runat="server" Text="Save" Height="40px" Width="80px" ForeColor="White"  
                     BackColor="#123A6B"  />
          <asp:Button ID="btnclose" runat="server" Height="40px" Width="80px" ForeColor="White"  
                     BackColor="#123A6B"  Text="Close" CausesValidation="false" /></td>
        </tr>
       
        </table>
        </div>

and c# code-

protected void btnelectivesubmit(object sender, EventArgs e)
{
 InsertElectGroupwithBatchId electivegroup = new InsertElectGroupwithBatchId();
            InsertElectivegroupBatchIddInput electivegroupinput = new InsertElectivegroupBatchIddInput();
            checkExistingDatawhileinsertigOutput checkoutput = new checkExistingDatawhileinsertigOutput();
            electivegroupinput.Name = dropdownbatch.SelectedItem.Text;
            electivegroupinput.Elective_Name = txtelectivename.Text.ToString().Trim();
            electivegroup.Execute(electivegroupinput);
            //checkoutput = 
            electivegroup.Execute(electivegroupinput);
            lblsubjectmassageshow.Text = "Elective group successfully created";
           // lblsubjectmassageshow.Text = checkoutput.message;
            lblsubjectmassageshow.Visible = true;
}