彩票矢量与for循环没有重复

Question

任务只是通过我（我们）学到的这些东西来解决问题。我的程序正在运行，除了我得到重复的随机数。请帮忙怎么做，我尝试了半天:(

int[] lotto = new int[6];
Random rnd = new Random();
int i;
int max, min;       

for (i = 0; i < 6; i++)
{
    lotto[i] = rnd.Next(1, 46);
    Console.Write("{0} ", lotto[i]);
}

max = lotto[0];
min = lotto[0];

for (i = 0; i < 6; i++)
{
    if (lotto[i] > max) max = lotto[i];
    if (lotto[i] < min) min = lotto[i];
}

Console.WriteLine("\nthe smallest num: {0} the biggest num: {1}", min, max);
Console.ReadKey();