public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int x, y, z,max;
            x = int.Parse(textBox1.Text);
            y = int.Parse(textBox2.Text);
            z = int.Parse(textBox3.Text);
           if(x>y)
           {
              if(y>z)
                  if(x>z)
              {
                   max=x;
                  z=y;
               }
               else
              {
                   x=z;
                   z=y;
               }
                   if(x>z)
               {
                   x=y;
               }
                   else if(y>z)
                   {
                       z = x;
                       max=y;
                       x = max;
                   }
               else
               {
                       max=z;
                       z=x;
                       x = max;
                   }
           }
            label1.Text = "最大值为：" + x+ "最小值为：" + z;
        }
    }
}
求正确的祥解！！！

int这一段能不能具体的解释下   看的不明白