public ActionResult Calc(FormCollection formCollection)
        {
            string result = string.Empty;

            CalculatorRepository calcRepository = new CalculatorRepository();

            // Use a FormulaModel object to pass into CalculatorRepository
            FormulaModel formulaModel = new FormulaModel();

            try
            {
                formulaModel.Operand1 = Convert.ToDouble(formCollection["Operand1"]);
                formulaModel.Operand2 = Convert.ToDouble(formCollection["Operand2"]);
                formulaModel.Operator = formCollection["Operator"];

                ViewBag.Result = calcRepository.CalculateOperands(formulaModel);
            }
            catch (Exception e)
            {
                Response.Write(e.InnerException);
            }

            return(View());
        }