string strPathDB = null;
        private void button2_Click(object sender, EventArgs e)
        {
            if (!File.Exists(strPathDB))
            {
                MessageBox.Show("檔案不存在");
                return;
            }
            string temp=DateTime.Now.Year.ToString();
            temp+=DateTime.Now.Month.ToString();
            temp+=DateTime.Now.Date.ToString();
            temp+=DateTime.Now.Hour.ToString();
            temp+=DateTime.Now.Minute.ToString();
            temp+=DateTime.Now.Second.ToString();
            temp=strPathDB.Substring(0,strPathDB.LastIndexOf("\\")+1)+temp;
            string temp2="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+temp;
            string strPathDB2="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+strPathDB;
            File.Copy(temp, strPathDB, true);
            File.Delete(temp);
            MessageBox.Show("完成");
        }

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