how to understand which rows selected in repeater? - asp.net

Question

I have a slideshow that images load from sql server.
here is my html code:
<!-- Elastislide Carousel -->
<ul id="Ul1" class="elastislide-list">
<asp:Repeater ID="Repeater2" runat="server">
<ItemTemplate>
<li>
<asp:Label ID="lbl" runat="server" Text='<%#Eval("IDMusic") %>' Visible="True"></asp:Label>
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl='<%#Eval("ImageUrl") %>' Width="250px" Height="250px" OnClick="ImageButton1_Click" />
</li>
</ItemTemplate>
</asp:Repeater>
</ul>
<!-- End Elastislide Carousel -->
<br /><br />
</div>
</div>
Now when, I run Project and user click on one of the imageButtons, I want to understand what is he/she clicked? for example he/she click on second ImageButton, Then I want to save IDMusic into a session and use this session in another page but I don't know how can i get IDmusic user clicked on?
here is my code behind :
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
foreach (RepeaterItem item in Repeater2.Items)
{
Label lbl = (Label)item.FindControl("lbl");
if (lbl != null)
{
Session["selectedmusicID"] = lbl.Text;
}
}
Response.Redirect("music.aspx");
}

Answer 1

There is no easy way to do so while handling click on the image itself. However you can leverage ItemCommand event here, which is a repeater event. Basically when some control is clicked inside the repeater, it generates a command in repeater which you can handle, and you can have item-specific arguments for it.
To define a command and args:
<asp:ImageButton ID="ImageButton1" ... CommandName="Select" CommandArgument='<%#Eval("IDMusic") %>' />
Command name here is custom, choose whatever you like. Now subscribe to the event of the repeater:
<asp:Repeater ID="Repeater2" runat="server"
OnItemCommand="Repeater2_ItemCommand">
And to handle:
protected void Repeater2_ItemCommand(object source, RepeaterCommandEventArgs e)
{
if (e.CommandName == "Select") //just in case you have more than one
{
e.CommandArgument //here is your ID
}
}