public string GenerateLists(InputNumber model) { if (ModelState.IsValid) { int number = model.Number; int highestNumberAccepted = Convert.ToInt32(ConfigurationManager.AppSettings["HighestNumberAccepted"]); if (number > highestNumberAccepted) { return("<span class=\"text-danger\">Please enter a number NOT greater than " + highestNumberAccepted + "</span>"); } List <int> allNumbers = new List <int>(); List <int> oddNumbers = new List <int>(); List <int> evenNumbers = new List <int>(); List <string> allNumbers_FlagMultiplesOf3 = new List <string>(); List <string> allNumbers_FlagMultiplesOf5 = new List <string>(); List <string> allNumbers_FlagMultiplesOf3And5 = new List <string>(); List <int> fibonacciNumbers = new List <int>(); bool isNumberEven; bool isNumberMultipleOf3; bool isNumberMultipleOf5; try { for (int i = 1; i <= number; i++) { isNumberEven = _NumericCalculation.IsNumberEven(i); isNumberMultipleOf3 = _NumericCalculation.IsNumberMultipleOf(i, 3); isNumberMultipleOf5 = _NumericCalculation.IsNumberMultipleOf(i, 5); allNumbers.Add(i); if (isNumberEven) { evenNumbers.Add(i); } else { oddNumbers.Add(i); } if (isNumberMultipleOf3) { allNumbers_FlagMultiplesOf3.Add("C"); } else { allNumbers_FlagMultiplesOf3.Add(i.ToString()); } if (isNumberMultipleOf5) { allNumbers_FlagMultiplesOf5.Add("E"); } else { allNumbers_FlagMultiplesOf5.Add(i.ToString()); } if (isNumberMultipleOf3 && isNumberMultipleOf5) { allNumbers_FlagMultiplesOf3And5.Add("Z"); } else { allNumbers_FlagMultiplesOf3And5.Add(i.ToString()); } } fibonacciNumbers = _NumericListGenerator.FibonacciSequence(number); StringBuilder myLists = new StringBuilder(); myLists.Append(listTitle_AllNumbers); myLists.Append(String.Join(", ", allNumbers)); myLists.Append(listSpacer); myLists.Append(listTitle_OddNumbers); myLists.Append(String.Join(", ", oddNumbers)); myLists.Append(listSpacer); myLists.Append(listTitle_EvenNumbers); myLists.Append(String.Join(", ", evenNumbers)); myLists.Append(listSpacer); myLists.Append(listTitle_AllNumbersExceptMultipleOf3); myLists.Append(String.Join(", ", allNumbers_FlagMultiplesOf3)); myLists.Append(listSpacer); myLists.Append(listTitle_AllNumbersExceptMultipleOf5); myLists.Append(String.Join(", ", allNumbers_FlagMultiplesOf5)); myLists.Append(listSpacer); myLists.Append(listTitle_AllNumbersExceptMultipleOf3And5); myLists.Append(String.Join(", ", allNumbers_FlagMultiplesOf3And5)); myLists.Append(listSpacer); myLists.Append(listTitle_FibonacciNumbers); myLists.Append(String.Join(", ", fibonacciNumbers)); myLists.Append(listSpacer); return(myLists.ToString()); } catch (Exception ex) { return("<span class=\"text-danger\">Error processing your request: " + ex.Message + "</span>"); } } // If we got this far, something failed return("<span class=\"text-danger\">An unhandled exception has occurred. Please retry submitting your number.</span>"); }