Asp. NET about the three-tier connection database

When connecting to a database in the middle tier, I would like to use the command method to read data from the database in DataReader, but not successful, I ask you what method. (I don't want to use adapter way) My code is as follows
[WebMethod]
Public System.Data.SqlClient.SqlDataReader GetData ()
{

System.Data.SqlClient.SqlDataReader reader;//= new System.Data.SqlClient.SqlDataReader ();
Sqlconnection.open ();
Sqlcommand.commandtext = "SELECT top 1 * authors";
reader = SqlCommand.ExecuteReader ();
Reader1 = reader["id"]. ToString ();
return reader;
}