random来分组之后出现大量连号
random来分组之后出现大量连号，求大神解决。一个text，两button和几个label

C# code

namespace 客栈二面摇号程序{    public partial class 客栈二面摇号程序 : Form    {        public 客栈二面摇号程序()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            int number =Convert.ToInt32(textBox1.Text);            int groups =4;            label1.Text = "请按小组顺序入座";            string[] strArr = Group(number, groups);            for (int i = 0; i < strArr.Length; i++)            {                label2.Text += "第" + (i + 1) + "组 " + strArr[i];            }        }         static string[] Group(int number, int groups)        {            List<int> list = new List<int>();            int num = number / 4;            string[] strArr = new string[groups];            for (int i = 1; i <= number; i++)                list.Add(i);            for (int i = 0; i < groups; i++)            {                for (int j = 0; j < num; j++)                {                    int value = list[new Random().Next(0, list.Count)];                    list.Remove(value);                    strArr[i] += value.ToString("D2") + " ";                                    }            }            return strArr;                     }         private void button2_Click(object sender, EventArgs e)         {             textBox1.Text = "";             label2.Text = "";         }    }

[解决办法]
把随机数据那行语句换成:
int value = list[new Random(Guid.NewGuid().GetHashCode()).Next(0, list.Count)];