写了几行代码，不知道哪里错了，总是提示FROM附近有错误，但是我在数据库里按我写的SELECT语句进行查询，没有出现差错呀，为什么？谢谢啦
        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection conn=new SqlConnection (@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\nn\Documents\Visual Studio 2008\Projects\CONNECT\tkfinal1.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
            SqlCommand cmd=new SqlCommand();
            conn.Open();
             ="select s_no1 AS 题号,s_sub AS 题目,s_sco AS 分数 from SUBJECT2"+"select s_no1,s_ans from ANSWER2";
            SqlDataAdapter da=new SqlDataAdapter ( ,conn);
            DataSet ds1=new DataSet ();
            da.SelectCommand = new SqlCommand(, conn);
            da.Fill (ds1);
            dataGridView1.DataSource = ds1.Tables[0];
            dataGridView2.DataSource = ds1.Tables[1];
            conn.Close();

        }

新来的报道。。。实在没分。。对不起各位。。。。拜托了

好了。。。可是为什么要加一个空格呢？