public void CalculateResult()
        {
            try
            {
                switch (Operation)
                {
                case ("+"):
                    Result = (FirstOperand.ToDouble() + SecondOperand.ToDouble()).ToDisplayString();
                    break;

                case ("-"):
                    Result = (FirstOperand.ToDouble() - SecondOperand.ToDouble()).ToDisplayString();
                    break;

                case ("*"):
                    Result = (FirstOperand.ToDouble() * SecondOperand.ToDouble()).ToDisplayString();
                    break;

                case ("/"):
                    Result = (FirstOperand.ToDouble() / SecondOperand.ToDouble()).ToDisplayString();
                    break;

                case ("%"):
                    Result = (FirstOperand.ToDouble() * SecondOperand.ToDouble() / 100D).ToDisplayString();
                    break;

                case ("√"):
                    Result = Math.Sqrt(SecondOperand.ToDouble()).ToDisplayString();
                    break;

                case ("1/x"):
                    Result = (1 / (SecondOperand.ToDouble())).ToDisplayString();
                    break;
                }
            }
            catch (Exception)
            {
                Result = "Error";
            }
        }