access datalist items

[Celine]

I'm using a datalist to display a picture and a dropdownlist
associated to it.
When clicked the picture should display a larger picture ( this is
working fine). When the user has selected a picture he has to select a
value from the dropdownlist which corresponds to diferent sizes for
the picture. My question is: how can I get the value of the
dropdownlist?
Please, I really need some help.
Thanks
<asp:datalist id="DataList1" runat="server" RepeatColumns=" 4"
BorderColor="#E 7E7FF" BorderStyle="No ne" BorderWidth="1p x"
BackColor="Whit e" CellPadding="3" GridLines="Hori zontal">
<SelectedItemSt yle Font-Bold="True" BorderWidth="2p x"
ForeColor="#F7F 7F7" BorderStyle="So lid" BorderColor="Pu rple"
BackColor="#738 A9C"></SelectedItemSty le>
<HeaderTemplate >
</HeaderTemplate>
<AlternatingIte mStyle BackColor="#F7F 7F7"></AlternatingItem Style>
<FooterTemplate >
</FooterTemplate>
<ItemStyle ForeColor="#4A3 C8C" BorderColor="Tr ansparent"
BackColor="#E7E 7FF"></ItemStyle>
<ItemTemplate >
<asp:ImageButto n ID="imageBtn1" runat="server" CommandName=sel ect
ImageUrl='<%# DataBinder.Eval (Container.Data Item, "PhotoName" , path)
%>'>
</asp:ImageButton ><br>
<asp:Label ID="Imagebutton 1" runat="server" Text='<%#
DataBinder.Eval (Container.Data Item, "PhotoId") %>'>
</asp:Label>
<br>
<asp:CheckBox ID="select" Runat="server"> </asp:CheckBox>
<br>
<asp:DropDownLi st ID="size" Runat="server" AutoPostBack="T rue" >
<asp:ListItem Value="6''*4''" >6''*4''</asp:ListItem>
<asp:ListItem Value="7''*5''" >7''*5''</asp:ListItem>
<asp:ListItem Value="8''*6''" >10''*8''</asp:ListItem>
</asp:DropDownLis t>
<br>
<asp:Label ID="price" Runat="server"> </asp:Label>
</ItemTemplate>
<FooterStyle ForeColor="#4A3 C8C" BackColor="#B5C 7DE"></FooterStyle>
<HeaderStyle Font-Bold="True" ForeColor="#F7F 7F7"
BackColor="#4A3 C8C"></HeaderStyle>
</asp:datalist>


private void DataList1_Selec tedIndexChanged (object sender,
DataListCommand EventArgs e)
{
string ImageLink;
ImageLink= ds.Tables[0].DefaultView[e.Item.ItemInde x].Row["photoname"].ToString();
Response.Redire ct("Pictures.as px?thisstring=" + ImageLink);
}