C#编程-72：dataGridView删除行

using System;
using System.Windows.Forms;
namespace DataGridViewContextMenuStrip
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO:  这行代码将数据加载到表“companyDataSet.clerk”中。您可以根据需要移动或删除它。
            this.clerkTableAdapter.Fill(this.companyDataSet.clerk);
        }
        private int rowIndex;
        private void dataGridView1_CellMouseUp(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                rowIndex=e.RowIndex;
                this.dataGridView1.Rows[e.RowIndex].Selected = true;
                this.dataGridView1.CurrentCell = dataGridView1.Rows[e.RowIndex].Cells[1];
                this.contextMenuStrip1.Show(dataGridView1, e.Location);
                this.contextMenuStrip1.Show(Cursor.Position);
            }
        }
        private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (!this.dataGridView1.Rows[rowIndex].IsNewRow)
            { 
                this.dataGridView1.Rows.RemoveAt(rowIndex);
            }
        }
    }
}