// Move up one line in the history.
private void MoveUp()
{
if (_history == null)
{
Console.Beep();
return;
}
if (_historyPosn == -1)
{
if (_history.Count > 0)
{
_historySave = new string(_buffer, 0, _length);
_historyPosn = 0;
SetCurrent(_history.GetItemAt(_historyPosn));
}
}
else if ((_historyPosn + 1) < _history.Count)
{
++_historyPosn;
SetCurrent(_history.GetItemAt(_historyPosn));
}
else
{
Console.Beep();
}
}
