Gets the index of the System.Web.UI.WebControls.DataListItem object from the DataList.Items collection of the control.
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Use the DataListItem.ItemIndex property to determine the index number of the System.Web.UI.WebControls.DataListItem object from the DataList.Items collection.
This property only applies to data items in the System.Web.UI.WebControls.DataList control. The DataListItem.ItemType property of the System.Web.UI.WebControls.DataListItem object must be set to ListItemType.Item, ListItemType.AlternatingItem, ListItemType.SelectedItem, or ListItemType.EditItem.