求指点，锯齿数组初始化

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ShuZu
{
    public class JuChiShuZu
    {
      
//        int[][] Juchi = new int[3][];
//        Juchi[0] = new int[3]{3,4,2};
//        Juchi[1] = new int[7]{1,2,3,4,5,6,7};
//        Juchi[3] = new int[4]{4,5,6,7};

        int[][] Juchi = new int[3][]{
                                        {1,2,3},
                                        {4,5,6,7,8,9},
                                        {1,2,3,4}
                                    };

            public void Print()
            {
               
                for (int i = 0; i < Juchi.Length; i++)
                {
                    for (int j = 0; j < Juchi[i].Length; j++)
                    {
                        Console.Write(Juchi[i][j] + " ");

                    }

                    Console.Write('\n');
                }
            }
        
    }
}

练习锯齿数组初始化，但是总是编译不过，同样的代码，放在notepad++里面可以过的了，但是控制台总是提示
“arry initializers can only be used in a variable or field initializer”
求大神指点