conform javascript code ,are you sure you want to delete

<script type="text/javascript">
        function delete123() {
            if (confirm('Do you want to delete this record?')){              
                return true;
            }
            else
           {                    
                return false;
            }
        }
</script>
 
 <asp:TemplateField>
         <ItemTemplate>
        <asp:LinkButton ID="LinkBtnDelete" runat="server" OnClientClick="return delete123();"
          CommandName="Delete">Delete</asp:LinkButton>
          </ItemTemplate>      
 </asp:TemplateField>