using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

public class Calculator
    {
        int sum;

        int[] EvenArray;

        List<int> evenNumbers = new List<int>();

        string[] randomNames = new string[10];

//This line gives an complie time error, as randomNames doesn't exist in current context

        randomNames[0]="Savresh";
}

private void MyMethod() {
    randomNames[0] = "Savresh";
}