C#怎么生成不重复随机数_C#

C#如何生成不重复随机数
这样就会生成好多重复的，求问大神怎么改
namespace cs1
{
    class Program
    {
        static void Main(string[] args)
        {
            double[] x = new double[100];
            double[] y = new double[100];
            double[] z = new double[100];
            for (int i = 0; i < 100; i++)
            {
                Random rd = new Random();
                x[i] = rd.Next();
                y[i] = rd.Next();
                z[i] = rd.Next();
                Console.WriteLine("{0} {1} {2} {3}",i,x[i],y[i],z[i]);
            }
            Console.ReadLine();
        }
    }
}

------解决思路----------------------

Random rd = new Random();//rd移到循环外面
for (int i = 0; i < 100; i++)
            {
                //Random rd = new Random();
                x[i] = rd.Next();
                y[i] = rd.Next();
                z[i] = rd.Next();
                Console.WriteLine("{0} {1} {2} {3}",i,x[i],y[i],z[i]);
            }