private void button2_Click(object sender, EventArgs e)
        {
            CData _cData = new CData();
            string sql = "update camel_thinner set thinner_name='呵呵'";
            _cData.setDS(sql);
        }
private void button3_Click(object sender, EventArgs e)
        {
            CData _cData = new CData();
            string sql = "insert into camel_thinner(thinner_name) values('稀释剂')";
            _cData.setDS(sql);
        }
public class CData
    {
        private OleDbConnection conn;
        private OleDbDataAdapter oda = new OleDbDataAdapter();
        private OleDbCommand cmd;
        private DataSet myds = new DataSet();
        public CData()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
            conn = new OleDbConnection(Properties.Settings.Default.connectionString);
        }
        public DataSet getDS(string strSQL)
        {
            myds = new DataSet();
            oda = new OleDbDataAdapter(strSQL, conn);
            oda.Fill(myds);
            return myds;
        }

        public DataSet getDS2(string strSQL, int si, int mi)
        {
            conn.Open();
            myds = new DataSet();
            oda = new OleDbDataAdapter(strSQL, conn);
            oda.Fill(myds, si, mi, "tab1");
            conn.Close();
            return myds;

        }

        public bool setDS(string strSQL)
        {
            conn.Open();
            cmd = new OleDbCommand(strSQL, conn);
            cmd.ExecuteNonQuery();
            conn.Close();
            return true;
        }
    }