Best Practice for Code

Good Day,
I have written my 1st C# console application.  I have tried looking up the answer to my question, but have not found anything that helps answer it, so here I am turning to you for help.  I'm trying to incorporate as many different items in a small appl. so I can refer to it as I develop other programs, so I included a case structure, a Parse method will probably include an IF then Else, had though about some type of module for this but haven't gotten there yet. 

it would not let them continue.  I think I could use an if elseif elseif elseif structure to accomplish the task, but isn't there a more concise way to do this?  I don't know if a Do While Loop would be in order Isolating the string f = Console.ReadLine(); line would be better or what.  Any suggestions would be appreciated.  Thank you.

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the first #:");
            int x = int.Parse(Console.ReadLine());

            Console.WriteLine("Which Mathematical operation are you going to do?");
            string f = Console.ReadLine();

            Console.WriteLine("Enter the second #:");
            int y = int.Parse(Console.ReadLine());

            switch (f){
                case "+": // Do Addition Block
                    int a = x + y;
                    Console.WriteLine("The answer is: " + a);
                    break;
                case "-": //Do Subtraction Block
                    int b = x - y;
                    Console.WriteLine("The answer is: " + b);
                    break;
                case "*": // Do Multiplication Block
                    int c= x * y;
                    Console.WriteLine("The answer is: " + c);
                    break;
                case "/": //Do Division Block
                    int d = x / y;
                    Console.WriteLine("The answer is: " + d);
                    break;}
            Console.ReadLine();
        }
    }
}