Solution Review: Check if Arrays are Disjoint

using System;
using System.Collections.Generic;
namespace chapter_9
{
    class challenge_2
    {
        static bool isDisjoint(int [] arr1, int [] arr2, int size1, int size2)
        {
            //Create a HashSet and store all values of arr1 in it
            HashSet<int> ht = new HashSet<int>(); ;
            // ht stores all the values of arr1
            for (int i = 0; i < size1; i++)
            {
                if (!ht.Contains(arr1[i]))
                    ht.Add(arr1[i]);
            }
            for (int i = 0; i < size2; i++)
            {
                if (ht.Contains(arr2[i]))
                    return false;
            }
            return true;
        }
    
        static void Main(string[] args)
        {
            int [] arr1 = { 9, 4, 3, 1, -2, 6, 5 };
            int [] arr2 = { 7, 10, 8 };
            Console.WriteLine(isDisjoint(arr1, arr2, 7, 3));
            return;
        }
    }
}