hello , i 've read the following article https://www.guru99.com/c-access-database.html there is a part where we use getvalue. i don't understand what does it do and what are those 0 and 1 in it ? and how can the output variable , which is defined as string , contain rows as if it was a table?

Step 2) In the final step, we will just display the output to the user and close all the objects related to the database operation. while (dataReader.Read()) " output output + dataReader . GetValue(8) + + dataReader .Getvalue(1) + " "; " Display the ovtput to the vser MessageBox.Show (Output); dataReader.Close)i l2 command.Dispose); cnn.close); Close all objects Code Explanation