How to get DatakeyValues in ItemCommand in Telerik Radgrid

Please use below code to get data key values from telerik radgrid.

protected void CompleteTickets_ItemCommand(object sender, GridCommandEventArgs e)
{
    if (e.CommandName == "Delete")
        //Ticket ID
        GridDataItem item = (GridDataItem)e.Item;
    int ticketID = Convert.ToInt32(item.GetDataKeyValue("TicketID"));
}