在ASPX页面上显示列表

我有一个C#函数返回一个列表，该函数存在于.dll文件中。如何在ASPX页面上重新显示列表。我是ASP.Net的新手，并尝试将其绑定到网格，但不起作用。

public static List<string>[] Select()
{
  server = "localhost";
  database = "cdl";
  uid = "root";
  password = "password";
  string connectionString;
  connectionString = "SERVER=" + server + ";" + "DATABASE=" + database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";
  connection = new MySqlConnection(connectionString);
  connection.Open();
  string query = "SELECT * FROM caleiddevice";
  //Create a list to store the result
  List<string>[] list = new List<string>[3];
  list[0] = new List<string>();
  list[1] = new List<string>();
  list[2] = new List<string>();
  //Open connection
  // if (this.OpenConnection() == true)
  // {
  //Create Command
  MySqlCommand cmd = new MySqlCommand(query, connection);
  //Create a data reader and Execute the command
  MySqlDataReader dataReader = cmd.ExecuteReader();
  // MySqlDataAdapter myDataAdapter = new MySqlDataAdapter(query, connection);
  //Read the data and store them in the list
  while (dataReader.Read())
  {
    list[0].Add(dataReader["device_id"] + "");
    list[1].Add(dataReader["status"] + "");
    list[2].Add(dataReader["timestamp"] + "");
  }
  //close Data Reader
  dataReader.Close();
  //close Connection
  // this.CloseConnection();
  //return list to be displayed
  return list;
  //}
  //else
  //{
  //   return list;
  // }
}

If (!IsPostBack)
{
  gridView1.DataSource=select();
  gridView1.DataBind();
}