public virtual Task UndoAsync()

// Executes an edit operation and demonstrates how to undo the operation programmatically.
await QueuedTask.Run(() =>
{
  var editOp = new EditOperation
  {
    Name = "My Name"
  };
  if (!editOp.IsEmpty)
  {
    //Execute and ExecuteAsync will return true if the operation was successful and false if not
    var result = editOp.Execute();
    if (result == true)
    {
      // If the operation was successful, you can undo it
      editOp.UndoAsync();
    }
  }
});

// Demonstrates how to undo and redo the most recent operation using the map's operation manager.
  //undo
  if (activeMap.OperationManager.CanUndo)
    activeMap.OperationManager?.UndoAsync();//await as needed

  //redo
  if (MapView.Active.Map.OperationManager.CanRedo)
    activeMap.OperationManager?.RedoAsync();//await as needed
}

{
  // in order to find a dockpane you need to know its DAML id
  pane = FrameworkApplication.DockPaneManager.Find(dockPaneID);

  // get the undo stack
  OperationManager manager = pane.OperationManager;
  if (manager != null)
  {
    // undo an operation
    // Use await with UndoAsync and RedoAsync
    if (manager.CanUndo)
      manager.UndoAsync().Wait();

    // redo an operation
    if (manager.CanRedo)
      manager.RedoAsync().Wait();

    // clear the undo and redo stack of operations of a particular category
    manager.ClearUndoCategory("Some category");
    manager.ClearRedoCategory("Some category");
  }
}