SqlCeDataAdapter只返回一行

Question

我正在使用SQL Server Ce并尝试获取AuthorID from table Author where fName + ' ' + lName = textBox3.text

查询必须返回存储在DataTable中的2个作者ID（2行），但我只得到一行只有第一个作者ID

public static DataTable Select(string sql)
    {
        SqlCeDataAdapter DataAdapter = new SqlCeDataAdapter(sql, conn);
        DataTable dt = new DataTable();           
        DataAdapter.Fill(dt);
        return dt;
    }

private void pictureBox1_Click(object sender, EventArgs e)
{
        string[] authors = textBox6.Text.Split(',');
        DataTable dt;
        string sql = @"select AuthorID from Author where ((fName + ' ' + lName = '" + authors[0] + @"')";
        for (int i = 0; i < authors.Length; i++)
        {
            if (i != authors.Length - 1)
            {
                sql += @"OR (fName + ' ' + lName = '" + authors[++i] + @"'))";                    
            }
        }
        dt = Form1.Select(sql);            
        dataGridView1.DataSource = dt;
        for (int i = 0; i < authors.Length; i++)
        {
            Form1.Query(@"insert into Book_Author ([ISBN], AuthorID) values (" + ISBN + ", " + dt.Rows[i]["AuthorID"] + ")");
        }

任何帮助??