public static void MenuS(Account SA) { string optionS; Regex Rgx = new Regex(@"\d+\.\d+"); do { Console.WriteLine("You accessed the Savings page:"); Console.WriteLine(String.Format("A. Deposit\nB. Withdraw\nC. Close + Report\nR. Go Back")); optionS = Console.ReadLine().ToUpper(); switch (optionS) { case "A": Console.WriteLine("Enter the amount you want to deposit:"); string stringAmountD = Console.ReadLine(); if (!(Rgx.IsMatch(stringAmountD))) { throw new FormatException("The number you entered is not acceptable"); } double.TryParse(stringAmountD, out double userAmountD); SA.MakeDeposit(userAmountD); break; case "B": Console.WriteLine("Enter the amount you want to withdraw:"); string stringAmountW = Console.ReadLine(); if (!(Rgx.IsMatch(stringAmountW))) { throw new FormatException("The number you entered is not acceptable"); } double.TryParse(stringAmountW, out double userAmountW); SA.MakeWithdrawl(userAmountW); break; case "C": Console.WriteLine(SA.CloseAndReport()); Console.WriteLine("The values yield a change of: {0:F2}%", SA.GetPercentageChange()); break; case "R": break; default: throw new InvalidOperationException("That's not what I'm looking for..."); } }while (optionS != "R"); }