using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Button bt1 = new Button();
            bt1.Location = new Point(0,dataGridView1.ColumnHeadersHeight);
            bt1.Text = "…";
            bt1.Width = 40;
            dataGridView1.Controls.Add(bt1);
            bt1.Click += new EventHandler(bt1_Click);
            dataGridView1.Rows.Add();
            dataGridView1.Rows[0].Cells[0].Value = "aaa";

        }
        private void bt1_Click(object sender, EventArgs e)
        {
          
            DataGridView d1 = new DataGridView();
            d1.Location = new Point(0, dataGridView1.ColumnHeadersHeight);//位置
            dataGridView1.Controls.Add(d1);
            d1.AutoGenerateColumns = true;       
           
            DataGridViewTextBoxColumn dc1 = new DataGridViewTextBoxColumn();           
            foreach (DataGridViewTextBoxColumn column in dataGridView1.Columns)
            {
                d1.Columns.AddRange(column.Clone() as DataGridViewColumn);
           
            }
            d1.Columns[0].Name = dataGridView1.Columns[0].Name;     
            d1.Rows[0].Cells[0].Value = "aaaaaa";

        }
    }
}