I'm a beginner in c# and trying to do multithreading.

I got 2 error that M and N need to be reference to be used in methods below.

I thought if I define it as public int M,N;, they should be able to use in any methods in the class.

Can somebody help me, please?

Error 1 An object reference is required for the non-static field, method, or property (for both M and N.)

```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
namespace TestMultithread2
{
public class Program
{
public int M, N;
static void Main(string[] args)
{
Console.WriteLine("input numbers of steps");
int N = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("input numbers of trials");
int M = Convert.ToInt32(Console.ReadLine());
Thread U_1Thread = new Thread(new ThreadStart(GetU_1));
Thread U_2Thread = new Thread(new ThreadStart(GetU_2));
U_1Thread.Start();
U_2Thread.Start();
U_1Thread.Join();
U_2Thread.Join();
Console.WriteLine("Finish");
Console.ReadLine();
}
static void GetU_1()
{
int newM = M; //this is where I got the error.
int newN = N;
Random rnd = new Random();
int row, col;
double[,] U_1 = new double[newM / 2, newN];
for (row = 0; row < newM / 2; row++)
{
for (col = 0; col < newN ; col++)
{
U_1[row, col] = Math.Sqrt(-2 * Math.Log(rnd.NextDouble())) * Math.Sin(2 * Math.PI * rnd.NextDouble());//Using Box Muller Random Method.
}
}
}
static void GetU_2()
{
Random rnd = new Random();
int row, col;
double[,] U_2 = new double[10 / 2, 10];
for (row = 0; row < 10 / 2; row++)
{
for (col = 0; col < 10; col++)
{
U_2[row, col] = Math.Sqrt(-2 * Math.Log(rnd.NextDouble())) * Math.Sin(2 * Math.PI * rnd.NextDouble());//Using Box Muller Random Method.
}
}
}
}
}
```