用SaveFileDialog将数据导出为Excel时，弹出2个保存对话框

Question

将datagridview数据导出为Excel文件时，弹出2次保存路径对话框，最后保存了2个EXCEL版本的数据，
一个是03版Excel的，一个是07版Excel。
我想知保存03版Excel的数据，该怎么做呢？

Answer 1

private void 导出ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                //没有数据就停止导出dataGridView1
                if (dataGridView1.Rows.Count == 0)
                {
                    MessageBox.Show("无数据导出");
                    return;
                }                SaveFileDialog saveFileDialog = new SaveFileDialog();
                saveFileDialog.DefaultExt="xls";
                saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
                saveFileDialog.FilterIndex = 0;
                saveFileDialog.RestoreDirectory = true;
                saveFileDialog.ShowDialog();                if (saveFileDialog.FileName.IndexOf(":") < 0) return;                //实例化一个Excel.Application对象
                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
                excel.Application.Workbooks.Add(true);                //生成Excel中列名
                for (int i = 0; i < dataGridView1.Columns.Count; i++)
                {
                    excel.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText;
                }                //把DataGridView当前页的数据保持在Excel中
                if (dataGridView1.Rows.Count > 0)
                {
                    for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                    {
                        for (int j = 0; j < dataGridView1.Columns.Count; j++)
                        {
                            if (dataGridView1[j, i].Value == typeof(string))
                            {
                                excel.Cells[i + 2, j + 1] = "" + dataGridView1[i, j].Value.ToString();
                            }
                            else
                            {
                                excel.Cells[i + 2, j + 1] = dataGridView1[j, i].Value.ToString();
                            }
                        }
                    }
                    excel.Visible = false;
                    excel.Save(saveFileDialog.FileName);
                    excel.Quit();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "错误提示");
            }
            
        }

Answer 2

ActiveSheet;
finally
    {
        if (excel!= null) excel.Quit();
        excel= null;
    }
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