C#如何对Access进行多表查询

string ConStr = "provider=Microsoft.jet.oledb.4.0;data source=" + Application.StartupPath + @"\MYText.mdb";
            OleDbConnection Olecon = new OleDbConnection(ConStr);
            Olecon.Open();
            //string sql = "Select * from 学生信息 where 学号= '" + textBox1.Text.Trim() + "' ";
            string sql = "Select Score ,Student from Student,Score where Score.STU_ID=Student.STU_ID";
            //string sql = "Select * from Score where Score.STU_ID=Student.STU_ID";
            //sql += sql + '"textBox1.Text.Trim()"';
            OleDbDataAdapter da = new OleDbDataAdapter(sql, Olecon);
            DataSet ds = new DataSet();
            da.Fill(ds);
            this.dataGridView1.DataSource = ds.Tables[0];
这是我的代码：
错误：至少一个参数没有被指定值

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debug一下，看看具体哪个参数没赋值。

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"Select Score.[Score] ,Student.[Student] from Student,Score where Score.STU_ID=Student.STU_ID";

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没有用啊……

引用

"Select Score.