Expected class,delegate,enum, interface,or struct

Error Expected class, delegate, enum, interface, or struct,i am unable to detect what can be issues.

[EDIT] Code added from comment:

////code with error///
public class Class1
    {
        private CardType _cardTypes;

     }
        public bool IsValidCardType(string cardNumber)
        {
            // AMEX -- 34 or 37 -- 15 length
            if ((Regex.IsMatch(cardNumber, "^(34|37)")) && ((_cardTypes & CardType.Amex) != 0))
                return (15 == cardNumber.Length);


                // MasterCard -- 51 through 55 -- 16 length
            else if ((Regex.IsMatch(cardNumber, "^(51|52|53|54|55)")) && ((_cardTypes & CardType.MasterCard) != 0))
                return (16 == cardNumber.Length);

                // VISA -- 4 -- 13 and 16 length
            else if ((Regex.IsMatch(cardNumber, "^(4)")) && ((_cardTypes & CardType.VISA) != 0))
                return (13 == cardNumber.Length || 16 == cardNumber.Length);

                // Diners Club -- 300-305, 36 or 38 -- 14 length
            else if ((Regex.IsMatch(cardNumber, "^(300|301|302|303|304|305|36|38)")) && ((_cardTypes & CardType.DinersClub) != 0))
                return (14 == cardNumber.Length);

                // enRoute -- 2014,2149 -- 15 length
            else if ((Regex.IsMatch(cardNumber, "^(2014|2149)")) && ((_cardTypes & CardType.DinersClub) != 0))
                return (15 == cardNumber.Length);

                // Discover -- 6011 -- 16 length
            else if ((Regex.IsMatch(cardNumber, "^(6011)")) && ((_cardTypes & CardType.Discover) != 0))
                return (16 == cardNumber.Length);

                // JCB -- 3 -- 16 length
            else if ((Regex.IsMatch(cardNumber, "^(3)")) && ((_cardTypes & CardType.JCB) != 0))
                return (16 == cardNumber.Length);

                // JCB -- 2131, 1800 -- 15 length
            else if ((Regex.IsMatch(cardNumber, "^(2131|1800)")) && ((_cardTypes & CardType.JCB) != 0))
                return (15 == cardNumber.Length);
            else
            {
                // Card type wasn't recognised, provided Unknown is in the CardTypes property, then
                // return true, otherwise return false.
                if ((_cardTypes & CardType.Unknown) != 0)
                    return true;
                else
                    return false;
            }
        }

Tags: C#, ASP.NET