为什么这个在Visual Studio c#控制台应用程序中会立即关闭?

{
   class Program
   {
      static void Main(string[] args)
      {
          Console.WriteLine("press enter to contiune");
          //math tutorial 
          Console.WriteLine("5 + 3 = " + (5 + 3));
          Console.WriteLine("5 - 3 = " + (5 - 3));
          Console.WriteLine("5 * 3 = " + (5 * 3));
          Console.WriteLine("5 / 3 = " + (5 / 3));
          Console.ReadLine();
          // casting
          //boolian
          double Pi = 31.4;
          int intPi = (int)Pi;
          //Math Functions
          // Acos Asin Atan Atan2 Cos Cosh Exp Log Sin Sinh Tan Tanh
          double num1 = 10.5;
          double num2 = 15;
          Console.WriteLine("Math.Max(num1, num2)" + Math.Max(num1, num2));
          Console.WriteLine("Math.Min(num1, num2)" + Math.Max(num1, num2));
          // other options: Abs Ceiling Floor Pow Round Sqrt
          Console.ReadLine();
      }
   }
}

//与f5调试只是说按回车等。//实在找不到解决办法