求助！请哪位高手可以帮我看一下我的datagridview怎么删除行啊

namespace qidong
{
    public partial class Form1 : Form
    {
        Class1 parameter;  //叶片的外形参数
        public Form1()
        {
            InitializeComponent();
            Init();
        }
        public void Init()
        {
            parameter = new Class1();
            parameter.Add(new Item(0, 0, 0, 0, 0, null));
            dataGridView1.DataSource = parameter ;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            //Item s = new Item();
            //parameter.Remove(s.Column1 );
            dataGridView1.DataSource = null;
            dataGridView1.DataSource = parameter;
        }

        private void button3_Click_1(object sender, EventArgs e)
        {
            parameter.Add(new Item());
            dataGridView1.DataSource = null;
            dataGridView1.DataSource = parameter;
        }

        private void button2_Click_1(object sender, EventArgs e)
        {
            Class1 cl2 = new Class1();
            foreach (Item item in parameter)
            {
                richTextBox1.Text += item.Column1.ToString ();
                //dataGridView2.DataSource = cl2;
            }
        }
    }
}
namespace qidong
{

    public class Class1 : List<Item>
    {
        public Class1() { }
    }
    public class Item
    {
        public Item()
        { }
        public Item(double d1, double d2, double d3, double d4, double d5, string d6)
        {
            Column1 = d1;
            Column2 = d2;
            Column3 = d3;
            Column4 = d4;
            Column5 = d5;
            Column6 = d6;
        }
        private double _dName1;
        private double _dName2;
        private double _dName3;
        private double _dName4;
        private double _dName5;
        private string  _dName6;
        public double Column1
        {
            get { return _dName1; }
            set { _dName1 = value; }
        }
        public double Column2
        {
            get { return _dName2; }
            set { _dName2 = value; }
        }
        public double Column3
        {
            get { return _dName3; }
            set { _dName3 = value; }
        }
        public double Column4
        {
            get { return _dName4; }
            set { _dName4 = value; }
        }
        public double Column5
        {
            get { return _dName5; }
            set { _dName5 = value; }
        }
        public string Column6
        {
            get { return _dName6; }
            set { _dName6 = value; }
        }
    }
}

补充：.NET技术 ,  C#