private void OnEraseHistory(object sender, EventArgs e)
{
string message = "Do you want to clear the history?";
string title = "History Clear";
if (String.IsNullOrEmpty(_history))
{
_messageBoxDisplayService.Show("The history is already empty!");
}
else
{
bool clearHistory = _messageBoxDisplayService.PromptUser(message, title);
if (clearHistory)
{
_history = "";
_calculatorView.SetHistoryBoxText(_history);
}
}
}