winform DataGridView设置选中单元格整行变色和隔行变色

 //设置网格颜色
            List<Student> stu = new List<Student>();
            Student s1 = new Student();
            s1.Name = "小明";
            s1.age = 23;
            stu.Add(s1);
            Student s2 = new Student();
            s2.Name = "老张";
            s2.age = 21;
            stu.Add(s2);
            Student s11 = new Student();
            s11.Name = "小李";
            s11.age = 30;
            stu.Add(s11);
            Student s22 = new Student();
            s22.Name = "云峰";
            s22.age = 20;
            stu.Add(s22);

            Student s111 = new Student();
            s111.Name = "小明";
            s111.age = 23;
            stu.Add(s111);
            Student s222 = new Student();
            s222.Name = "老张";
            s222.age = 21;
            stu.Add(s222);
            Student s1111 = new Student();
            s1111.Name = "小李";
            s1111.age = 30;
            stu.Add(s1111);
            Student s2222 = new Student();
            s2222.Name = "云峰";
            s2222.age = 20;
            stu.Add(s2222);



            //绑定数据源
            dataGridView1.DataSource = stu;
            //选中单元格整行变色
            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;//设置整行变色
            dataGridView1.DefaultCellStyle.SelectionBackColor = Color.Yellow;//设置背景色
            dataGridView1.DefaultCellStyle.SelectionForeColor = Color.LightBlue;//设置前景色

            //设置隔行换色
            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                if (i % 2 == 0)
                {
                    dataGridView1.Rows[i].DefaultCellStyle.BackColor = Color.Red;
                }
            }