Help with this coding problem.

public class Solution {
    public int[] SortArrayByParityII(int[] nums) {
       int n = Convert.ToInt32(nums);
        if(n % 2 == 0)
        {
            Console.WriteLine(n);
        }
        else
        {
            Console.WriteLine(n);
        }
    }
}

Line 2: Char 18: error CS0161: 'Solution.SortArrayByParityII(int[])': not all code paths return a value (in Solution.cs)