Two string - use Hashtable - code can be more readable

TwoString12.cs

using System;
using System.Collections;
using System.IO;
class Solution {
    static void Main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution */
        int N = Convert.ToInt32(Console.ReadLine());
        for( int i=0; i<N; i++ ) {
            string A = Console.ReadLine();
            string B = Console.ReadLine();
            int lenA = A.Length;
            int lenB = B.Length;
            Hashtable ht = new Hashtable();
            for( int c=0; c<lenB; c++ ) {
                if( !ht.ContainsKey(B[c]) ) {
                    ht.Add(B[c],null);
                }
            }
            string result = string.Empty;
            for( int c=0; c<lenA; c++ ) {
                if( ht.ContainsKey(A[c]) ) {
                    result = "YES";
                    break;
                }
            }
            if( result==string.Empty ) result = "NO";
            Console.WriteLine(result);
        }
    }
}