How to display a label text throgh a modal popup extender

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C#

ASP.NET

Ajax

I assign some data to a Label control 'LblDetails' in run time. I have a button id 'BtnDetails'.
The following code is not displaying the data contained in 'LblDetails'. I understand that on click of button 'BtnDetails' it is not going to 'eventDetails'. How to make everything fine so that I could see the data available in that 'LblDetails' seen through 'modal popup extender'.

<asp:UpdatePanel ID="dd" runat="server"   >
   <ContentTemplate>
    <asp:Button ID="AddToCart"  runat = "server" Text='Add to Cart'   BackColor="DarkSlateBlue" Width="100px"  Style=" font-family:Arial" ForeColor="White" commandname="myevent">
    </asp:Button>
    <asp:Button ID="BtnDetails"  runat = "server" Text='Details'   BackColor="DarkSlateBlue" Width="100px"  Style=" font-family:Arial" ForeColor="White" commandname="myeventDetails">
    </asp:Button>
<asp:modalpopupextender id="ModalPopupExtender1" runat="server"
    cancelcontrolid="btnCancel" okcontrolid="btnOkay"
    targetcontrolid="BtnDetails" popupcontrolid="Lbldetails"
    popupdraghandlecontrolid="PopupHeader" drag="true"
    backgroundcssclass="ModalPopupBG">
</asp:modalpopupextender>
<asp:Label id="Lbldetails" style="display: none" runat="server">
    <div class="HellowWorldPopup">
    <div class="PopupHeader" id="PopupHeader">Header</div>
    <div class="PopupBody">
    <p>This is a simple modal dialog</p>
    </div>
    <div class="Controls">
    <input id="btnOkay" type="button" value="Done" />
   <input id="btnCancel" type="button" value="Cancel" />
        </div>
        </div>
   </asp:Label>
    </ContentTemplate>
    </asp:UpdatePanel>

 if (e.CommandName == "myeventDetails") // check commandname here
        {
            int index = e.Item.ItemIndex;
            Label lbl1 = (Label)DataList1.Items[index].FindControl("lblProductId");
            v_code = Convert.ToInt32(lbl1.Text);
            Label CategoryLbl = (Label)DataList1.Items[index].FindControl("CategoryLbl");
            v_categoryid = Convert.ToInt32(CategoryLbl.Text);
            SqlCommand cmd4 = new SqlCommand("SELECT DescriptionStatic from product WHERE CategoryId='" + v_categoryid + "' and ProductId='" + v_code + "'", con);
        SqlParameter param4 = new SqlParameter();
        param4.ParameterName = "@v_mem_id1";
        param4.Value = "ss";
        cmd4.Parameters.Add(param4);
        con.Open();
        SqlDataReader reader1 = cmd4.ExecuteReader();
        if (reader1.HasRows)
        {
            while (reader1.Read())
            {
                string v_descriptionstatic = reader1.GetString(0);
                Lbldetails.Text = v_descriptionstatic;
}
}
}