C# do...while循环

using System;

namespace Loops {

   class Program {

      static void Main(string[] args) {
         /* local variable deFinition */
         int a = 10;

         /* do loop execution */
         do {
            Console.WriteLine(value of a: {0}, a);
            a = a + 1;
         } 
         while (a < 20);
         Console.ReadLine();
      }
   }
}