สอบถามเรื่องdatagridview จะให้โชว์ลำดับล่าสุดครับ จะเขียนโค้ดยังไง ในvb.net 2003

string conStr = "";
conStr = "Data Source = localhost; Initial Catalog = train; User ID = user id; Password = password;";
SqlConnection sqlCon = new SqlConnection();
sqlCon.ConnectionString = conStr;
sqlCon.Open();

string sql = "SELECT CustomerID FROM customer ORDER BY CustomerID DESC";
SqlDataAdapter da = new SqlDataAdapter(sql,sqlCon);

DataTable dt = new DataTable();
da.Fill(dt);
dataGridView1.DataSource = dt;