c#中求最大公约数和最小公倍数

static void Main(string[] args)
        {
            int a = 4;
            int b = 6;
            int m;
            int k;
            for (int i = 1; i <= b; i++)
            {
                if (a * i % b == 0)
                {
                    m = a * i;
                    Console.WriteLine("最小公倍数:"+m.ToString());
                    break;
                }
            }
            if (a > b)
            {
                k = b;
            }
            else
            {
                k = a;
            }
            for (int i = k; i >= 1; i--)
            {
                if (a % i == 0 && b % i == 0)
                {
                    Console.WriteLine("最大公约数:"+i.ToString());
                    break;
                }
            }