You can iterate on a child collection with the prefefined TrueCondition, like this:

  foreach(AutomationElement child in epoWindow.FindAll(TreeScope.Subtree, Condition.TrueCondition))
  {
      if (child.Current.Name.Contains("whatever"))
      {
          // do something
      }
  }

PS: You want to carefully choose the TreeScope if you don't want to kill the performance of your app (if it has a big children hierarchy) or wait indefinitely...