Help with datalist

[Celine]

I'm using a datalist to display images from a database. I'm using
ImageButton within it to display each pictures.Everything is working
fine. I need to know now how to get the name of each of the pictures
that have been displayed. That is to say when the user clicks an Image
the name of this image has to be displayed in a label.Can anyone help
me to do it?
Thanks
<asp:datalist id="DataList1" runat="server" BorderWidth="1px"
GridLines="Both" CellPadding="4"
BorderStyle="None" BackColor="White" BorderColor="#CC9966"
RepeatColumns="4" >
<SelectedItemStyle Font-Bold="True" ForeColor="#663399"
BackColor="#FFCC66"></SelectedItemStyle>
<HeaderTemplate>
</HeaderTemplate>
<FooterTemplate>
</FooterTemplate>
<ItemStyle ForeColor="#330099" BackColor="White"></ItemStyle>
<ItemTemplate>
<asp:ImageButton ID="imageBtn1" runat="server" CommandName=select
ImageUrl='<%# DataBinder.Eval(Container.DataItem, "thumbsLink", toto)
%>'>
</asp:ImageButton>
</ItemTemplate>
<FooterStyle ForeColor="#330099" BackColor="#FFFFCC"></FooterStyle>
<HeaderStyle Font-Bold="True" ForeColor="#FFFFCC"
BackColor="#990000"></HeaderStyle>
</asp:datalist>
private void Build_List()
{
try
{

connection.Open();
string strsql="select * from portfolio";
SqlDataAdapter oda = new SqlDataAdapter(strsql,connection);
DataSet ods = new DataSet();
oda.Fill(ods,0,16,"portfolio");
DataList1.DataSource=ods.Tables["portfolio"].DefaultView;
DataList1.DataBind();
connection.Close();
}
catch(Exception ex)
{
Response.Write(ex.Message+" "+ex.StackTrace);
}

}