Add row In dynamically with dropdown

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Gridview

Hi,
I have gridview with two dropdown as follows

<asp:GridView runat="server" ID="folderLoadCodeGV" AutoGenerateColumns="false"
            EnableDelete="true" EmptyDataText="Please Select" Width="100%"
            ShowHeaderWhenEmpty="true" onrowdatabound="folderLoadCodeGV_RowDataBound"
            onrowinserting="folderLoadCodeGV_RowInserting">
            <Columns>
                <asp:TemplateField HeaderText="ValName">
                    <ItemTemplate>
                        <asp:DropDownList ID="ddl1" runat="server"
                            Width="120px"  DataSource='<%#GetCategoryCode()%>' >
                        </asp:DropDownList>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Define Compare Source">
                    <ItemTemplate>
                        <asp:DropDownList DropDownStyle="DropDown" ID="ddl2" runat="server"
                            Width="120px" IsRequired="true">

                        </asp:DropDownList>
                    </ItemTemplate>
                </asp:TemplateField>

</asp:GridView>

I want to add row dynamically on button click and want datasource of dynamic dropdown from database.I am able to add rows dynamically but dropdown is not binding.
Please help.
Thx in advanced