Concat dropdownlist values into a comma separted string

[dodge20]

I have a gridview that has a dropdown list in each row. The dropdowns are named ur1,url2,url3 etc.
I would like to combine the selected values of all those dropdowns into a comma separted list and store it in a hidden field.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
            DataSourceID="SqlDataSource1">
            <Columns>
                <asp:BoundField DataField="ProductName" HeaderText="Columns" 
                    SortExpression="ProductName" />
                <asp:TemplateField AccessibleHeaderText="MapTo" HeaderText="MapTo">
                   <ItemTemplate>
                     <select name='URL<%# Container.DataItemIndex + 1 %>' onchange='update_selection(this);'>
     <option value=''>Select a Continent</option>
      <option value='North America'>North America</option>
      <option value='South America'>South America</option>
      <option value='Africa'>Africa</option>
      <option value='Europe'>Europe</option>
      <option value='Asia'>Asia</option>
      <option value='Australia'>Australia</option>
    </select>
                    </ItemTemplate>

                </asp:TemplateField>
            </Columns>
        </asp:GridView>

Any help is appreciated.

Dodge20

 

[jbenson001]

You could call an onchange() javacript function on each of the ddls you want to capture data from.