Explication d'un code ado.net

Bonjour,


svp si quelqu'un peut m'expliquer ce code d'ado.net merci


public static ArrayList GetQuizByEnseignant(int Enseignant)
{
ArrayList Quiz=new ArrayList();
QuizInfo quiz=null;
string queryString="QuizEnseignantList";
{
SqlDataReader reader;
using (SqlConnection connection =
new SqlConnection(connectionString))
{
SqlCommand command =
new SqlCommand(queryString, connection);
command.CommandType=CommandType.StoredProcedure;
SqlParameter EnseignantId= new SqlParameter("@EnseignantId", SqlDbType.Int, 4);
EnseignantId.Value=Enseignant;
command.Parameters.Add(EnseignantId);
connection.Open();
reader = command.ExecuteReader();

while (reader.Read())

{
quiz=new QuizInfo(int.Parse(reader.GetValue(0).ToString()), reader.GetValue(1).ToString() ,int.Parse( reader.GetValue(2).ToString()) , reader.GetValue(3).ToString() ,reader.GetValue(4).ToString() ,reader.GetValue(5).ToString() , reader.GetValue(6).ToString() , reader.GetValue(7).ToString() , reader.GetValue(8).ToString() , reader.GetValue(9).ToString() ,DateTime.Parse(reader.GetValue(10).ToString()),DateTime.Parse(reader.GetValue(11).ToString()) ,float.Parse(reader.GetValue(12).ToString()) ,int.Parse(reader.GetValue(13).ToString()) ,float.Parse(reader.GetValue(14).ToString()));
Quiz.Add(quiz);
}
reader.Close();
return Quiz;
}
}
}