Option yes/no C# Console

Question

I\'m creating a C# program for the Currency Converter by console. At the end I would to insert \"Continue? (yes/no)\". Here the user have to chose. I\'ve tried this but it

Answer 1

        float Dollaro = 1.32f, Euro, Cambio;
        string EuroStr;
        ConsoleKeyInfo risposta;
        do
        {
            Console.Write ( "Euro: " );
            EuroStr = Console.ReadLine ();
            bool result = Single.TryParse ( EuroStr, out Euro );
            if ( result )
            {
                Cambio = Dollaro * Euro;
                Console.WriteLine ( "Dollaro: " + Cambio );
            } else {
                Console.WriteLine ( "Please enter a number" );
            }
            bool check = false;
            do {
                Console.Write ( "\nVuoi continuare? (yes/no) " );
                risposta = Console.ReadKey ( true );
                check = !( ( risposta.Key == ConsoleKey.Y ) || ( risposta.Key == ConsoleKey.N ) );
            } while ( check );
            switch ( risposta.Key )
            {
                case ConsoleKey.Y: Console.WriteLine ( "Yes" ); break;
                case ConsoleKey.N: Console.WriteLine ( "No" ); break;
            } 
        } while ( risposta.Key != ConsoleKey.N );

I've changed some things:

• if I enter a character for the Euro - FormatException ^msdn. So I've added a TryParse();
• I've changed the response from string to ConsoleKeyInfo ^msdn - this makes the check for "Y" or "N" easier and I think clearer, and there is no need to cast the user input with ToLower() ^msdn and compare it with a string;
• also a check if the user presses "Y" or "N", while the input is different, the same message will appear - Console.Write ( "\nVuoi continuare? (yes/no) " );

In general you should filter all data\info ( whatever ) comes from the user, to avoid exception.