sorry i am very very new in programming.
My question is at switch statemnt if user type different of 1,2 or 3 i dont want to break but i want to start from beginning asking user again to type 1, 2 or 3, i know how to do with goto statemend, but i have read that is not prefered to use that statement.
Second question: is that right if i use multiple do while loops inside one class. please help and sorry about my english it is my second language.

class Program
        {
            static void Main(string[] args)
            {
                string secondchoice = "";
                int userchoice;
                int TotalCost = 0; ;

 do
            {

                Console.WriteLine("1-Small, 2-Medium, 3-Large");
               userchoice = int.Parse(Console.ReadLine());

               switch (userchoice)
               {
                   case 1:
                       TotalCost += 1;
                       break;
                   case 2:
                       TotalCost += 2;
                       break;
                   case 3:
                       TotalCost += 3;
                       break;
                   default:
                       Console.WriteLine("Your choice is invalid");
                       break;                                   
               }

                if (userchoice == 1)
                {
                    Console.WriteLine("Small Caffe");
                }
                else if (userchoice == 2)
                {
                    Console.WriteLine("Medium");
                }
                else if (userchoice == 3)
                {
                    Console.WriteLine("Big");
                }
                else
                    Console.WriteLine("Invalid choice");

                do
                {
                    Console.WriteLine("Anything else say yes or no");
                    secondchoice = Console.ReadLine();

                    if (secondchoice != "yes" && secondchoice != "no")
                    {
                        Console.WriteLine("Invalid choice, try again say yes or no");
                    }
                }
                while (secondchoice != "yes" && secondchoice != "no");
            }
            while (secondchoice == "yes");

            Console.WriteLine("Thank you for shooping with us");
            Console.WriteLine("Total =" + TotalCost);
        }
    }
}
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