Find least and greatest common factors

using System;
 class Program
{
    static void Main(string[] args)
    {
        Class ob = new Class();
        int lcf, gcf;
        if (ob.HasComFactor(231, 105, out lcf, out gcf))
        {
            Console.WriteLine("Lcf of 231 and 105 is " + lcf);
            Console.WriteLine("Gcf of 231 and 105 is " + gcf);
        }
        else
            Console.WriteLine("No common factor for 35 and 49.");
        if (ob.HasComFactor(35, 51, out lcf, out gcf))
        {
            Console.WriteLine("Lcf of 35 and 51 " + lcf);
            Console.WriteLine("Gcf of 35 and 51 is " + gcf);
        }
        else
            Console.WriteLine("No common factor for 35 and 51.");
    }
}

public class Class
{
    public bool HasComFactor(int x, int y, out int least, out int greatest)
    {
        int max = x < y ? x : y;
        bool first = true;
        least = 1;
        greatest = 1;
        for (int i = 2; i <= max / 2 + 1; i++)
        {
            if (((y % i) == 0) & ((x % i) == 0))
            {
                if (first)
                {
                    least = i;
                    first = false;
                }
                greatest = i;
            }
        }
        if (least != 1) return true;
        else return false;
    }
}