/// <summary>
/// Calculates the result and updates the result textbox
/// </summary>
private void UpdateResult()
{
Context currentContext = null;
IExpression currentExpression = null;
if (ExpressionReader.ReadExpression(expression, ref currentExpression, ref currentContext))
{
txt_Result.Text = currentExpression.Interpret(currentContext).ToString(CultureInfo.CurrentCulture);
}
else
{
txt_Result.Text = "Expression invalid!";
}
}