private void Form1_Load(object sender, EventArgs e)

         {

             Random x = new Random();

             int i = x.Next(); //生成一个大于等于0，小于100之间的随机数

             this.label1.Text =

             string.Format("{0}", i);

         }

         private void button1_Click(object sender, EventArgs e)

         {

             Form1_Load(null, null);  //刷新界面

         }

         private void label1_Click(object sender, EventArgs e)

         {

         }