SQL连接数据库

            sqlconnection conn = null;
            string constring = "data source=; initial catalog=数据库名;user id=账户;password=密码";//连接数据库的字符串
            conn = new sqlconnection(constring);
            conn.open();//打开数据库连接
            if (conn.state == connectionstate.open)

            {

                //  console.writeline("数据库连接成功");
            }

            string sql = "select * from le_calibration where mo='m0pwp2sma01001'";
            sqldataadapter da = new sqldataadapter(sql, conn);//从数据库中查询
            conn.close();
            dataset ds = new dataset();
            da.fill(ds, "product");//将数据填充到dataset
            datatable mytable = ds.tables["product"];