how to get prime numbers by using array when user give value

class program

{

void prime()

{

int num = 0;

int[] arr=new int[10];

Console.WriteLine("ENTER ARRAY VALUES");

for (int j = 0; j < arr.Length;j++ )

{

arr[j] =Convert.ToInt32( Console.ReadLine());

}

for (int i = 0; i <=arr.Length-1; i++)

{

int counter = 0;

for (num = arr[i]; num >= 1; num--)

{

if (arr[i] % num == 0)

{

counter = counter + 1;

}

if (counter == 2)

{

Console.WriteLine("Array Prime numbers are :"+arr[i]);

}

static void Main (string[] args)

{

program p=new program();

p. prime();

console.readline();

}