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  private void copyAlltoClipboard()
        {
            dataGridView1.SelectAll();
            DataObject dataObj = dataGridView1.GetClipboardContent();
            if (dataObj != null)
                Clipboard.SetDataObject(dataObj);
        }

        /// <summary>
        /// 导出数据到Excel
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void btnExportData_Click(object sender, EventArgs e)
        {
            copyAlltoClipboard();
            Microsoft.Office.Interop.Excel.Application xlexcel;
            Microsoft.Office.Interop.Excel.Workbook xlWorkBook;
            Microsoft.Office.Interop.Excel.Worksheet xlWorkSheet;
            object misValue = System.Reflection.Missing.Value;
            xlexcel = new Microsoft.Office.Interop.Excel.Application();
            xlexcel.Visible = true;
            xlWorkBook = xlexcel.Workbooks.Add(misValue);
            xlWorkSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
            for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
            {
                xlWorkSheet.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
            }  

            Microsoft.Office.Interop.Excel.Range CR = (Microsoft.Office.Interop.Excel.Range)xlWorkSheet.Cells[2, 1];
            CR.Select();
            xlWorkSheet.PasteSpecial(CR, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, true);
        }