private void OnEvaluateClick(object sender, EventArgs e)
{
EvaluatorParameters parameters = evaluator.CreateEmptyParameters();
this.SetParameters(currentExpressionValue, parameters);
this.resultLabel.Text = evaluator.Evaluate(parameters).ToString();
Graphics graphics = resultLabel.CreateGraphics();
SizeF resultSizeF = graphics.MeasureString(resultLabel.Text, resultLabel.Font);
Size resultSize = Size.Truncate(resultSizeF);
this.resultLabel.Width = resultSize.Width + 1;
this.ResizePanel();
}
