Declare a variable or array inside a methode in C#

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C#

so i wanted to play around with arrays in c# for learning purpose. but when i declare my array inside a method it gives the error } expected. here is my code

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

namespace kwaterminal
{
    class RandomTerain
    {
        public static void generate()
        {
            public int[,] terain = new int[16, 16];

        }
    }
}

What I have tried:

i heave searched the web but i could not find a good answer