Datagridview没有显示结果

Question

我不知道我的代码出了什么问题，即使我通过许多堆栈溢出讨论浏览过，并且与在数据网格中填充结果的方式相同。 有人能告诉我这里有什么问题：

 private void frmGridVw_Load(object sender, EventArgs e)
    {
        string connectionString = "Data Source=.;Initial Catalog=AdventureWorks;User ID=sa";
        string selectString = "Select Title, FirstName, LastName, Suffix, EmailAddress " +
           "From AdventureWorks.Person.Contact " +
           "Where Suffix = 'Jr.'";

        SqlConnection mySqlConnection = new SqlConnection(connectionString);
        mySqlConnection.Open();
        SqlDataAdapter dataAdapter = new SqlDataAdapter(selectString, mySqlConnection);
        DataSet ds = new DataSet();

        dataAdapter.Fill(ds);
        dataGridView1.ReadOnly = true;
        dataGridView1.DataSource = ds.Tables[0];


    }