TransactionScope rollback.

Hi

How to rollback a TransactionScope. I tried adding new elements List in a transaction using TransactionScope and never called the complete method. Even after that the methods inside the Transaction are executed and are not rolled back. Below is the sample code.

I was expecting output to be
1
2
1

but the actual output was
1
2
2

Could anyone tell me how to get the expected output using the below code.

Thank You

static void Main(string[] args)
        {
            List<string> foo = new List<string>();
            foo.Add("a");
            Console.WriteLine("Before Transaction: "+foo.Count);
            
            try
            {
                using (TransactionScope ts = new TransactionScope(TransactionScopeOption.RequiresNew))
                {                    
                    foo.Add("b");                    
                    Console.WriteLine("During Transaction: "+foo.Count);
                }
            }
            catch 
            {
            }

            Console.WriteLine("After Transaction: " + foo.Count);            
            Console.Read();
        }

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