fetch data from database to a model pop up extender

See more:

ASP.NET

ModalPopUpExtender

I have this code and what I want is to fetch data from database and assign the data to the label in the popup.I have add a click event to the "addnew" button but code behind is not working because of the client side model pop.Is there any way to do this?

<form id="form1" runat="server">
<div>
<asp:ScriptManager runat="server"></asp:ScriptManager>
   <asp:Button ID="addnew" OnClick="addnew_Click" runat="server" Text="Add New" CssClass="btn btn-warning"  />

    <asp:Panel ID="panelRegister" CssClass="modalPopup form-control" runat="server" Style="display: none;">
        <div class="row" style="margin-removed 5px">
            <div class="col-xs-8">
                <asp:Label ID="Label1" runat="server" Font-Size="Smaller"></asp:Label>
            </div>
            <div class="col-xs-4"></div>
        </div>
        <br />

        <div class="row">
            <div class="col-xs-3"></div>
            <div class="col-xs-3">
                <asp:Button ID="cancel" runat="server" CssClass="btn btn-default" Text="Ok" CausesValidation="False" />
            </div>
            <div class="col-xs-3"></div>
        </div>
        <br />
    </asp:Panel>
    <ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1"  runat="server" BackgroundCssClass="modalBackground" PopupControlID="panelRegister" TargetControlID="addnew"></ajaxToolkit:ModalPopupExtender>
</div>
</form>

code behind function I have used

protected void addnew_Click(object sender, EventArgs e)
        {
            string sqlsel = "SELECT name FROM dbo.patient nic = '568921452' ";
            SqlCommand com = new SqlCommand(sqlsel, DBcon.connection());
            SqlDataReader dr = com.ExecuteReader();
             
            if(dr.Read())
            {
                Label1.Text = dr[0].ToString();
            }
        }