radRotator

OnItemClick="RadRotator1_ItemClick">
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CustomIDProperty=' XPath("id") ' Style="width: 300px; height: 200px;" />

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using Telerik.Web.UI;
public void RadRotator1_ItemClick(object sender, RadRotatorEventArgs e)
{
Image img = e.Item.FindControl("Image1") as Image;
string id = img.Attributes["CustomIDProperty"];
}