Reg:validation script

[vinoth82]

Totally i a have ten row,

<table border="0" cellpadding="0" cellspacing="0" width="100%">
                                <tr>
                                    <td style="width: 10%" align="center">
                                        <asp:Label ID="lblid2" runat="server" Text="2"></asp:Label>
                                    </td>
                                    <td style="width: 25%">
                                        <asp:DropDownList ID="ddCategory1" runat="server" AutoPostBack="true" CssClass="Controls_Input"
                                            Width="200px">
                                        </asp:DropDownList>                                          
                                    </td>
                                    <td style="width: 5%">
                                    </td>
                                    <td style="width: 25%">
                                        <asp:DropDownList ID="ddsubcategory1" runat="server" CssClass="Controls_Input" Width="200px">
                                        </asp:DropDownList>
                                    </td>
                                    <td style="width: 5%">
                                    </td>
                                    <td style="width: 30%">
                                        <asp:FileUpload ID="fuExceldata1" runat="server" />
                                    </td>
                                </tr>
                            </table>

like above i have ten row , first i will display on row which having
category drop down, subcategory dropdown and file upload control on it.
below i would place a add button. when i click the button then only the next row will open, i have put every thing in div. how to validate the dropdown box which is open.

[Frinavale]

What do you want to validate?
What exactly are you trying to do?