MySql.Data.MySqlClient.MySqlDataReader.Close C# (CSharp) Method

    public override void Close()
    {
      if (!isOpen) return;

      bool shouldCloseConnection = (commandBehavior & CommandBehavior.CloseConnection) != 0;
      CommandBehavior originalBehavior = commandBehavior;

      // clear all remaining resultsets
      try
      {
        // Temporarily change to Default behavior to allow NextResult to finish properly.
        if (!originalBehavior.Equals(CommandBehavior.SchemaOnly))
          commandBehavior = CommandBehavior.Default;
        while (NextResult()) { }
      }
      catch (MySqlException ex)
      {
        // Ignore aborted queries
        if (!ex.IsQueryAborted)
        {
          // ignore IO exceptions.
          // We are closing or disposing reader, and  do not
          // want exception to be propagated to used. If socket is
          // is closed on the server side, next query will run into
          // IO exception. If reader is closed by GC, we also would 
          // like to avoid any exception here. 
          bool isIOException = false;
          for (Exception exception = ex; exception != null;
            exception = exception.InnerException)
          {
            if (exception is System.IO.IOException)
            {
              isIOException = true;
              break;
            }
          }
          if (!isIOException)
          {
            // Ordinary exception (neither IO nor query aborted)
            throw;
          }
        }
      }
      catch (System.IO.IOException)
      {
        // eat, on the same reason we eat IO exceptions wrapped into 
        // MySqlExceptions reasons, described above.
      }
      finally
      {
        // always ensure internal reader is null (Bug #55558)
        connection.Reader = null;
        commandBehavior = originalBehavior;
      }
      // we now give the command a chance to terminate.  In the case of
      // stored procedures it needs to update out and inout parameters
      command.Close(this);
      commandBehavior = CommandBehavior.Default;

      if (this.command.Canceled && connection.driver.Version.isAtLeast(5, 1, 0))
      {
        // Issue dummy command to clear kill flag
        ClearKillFlag();
      }

      if (shouldCloseConnection)
        connection.Close();

      command = null;
      connection.IsInUse = false;
      connection = null;
      isOpen = false;
    }

        public static void Login(string username, string passhash)
        {
            if (Validate(username, passhash))
            {
                time = string.Format("{0:yyyy.MM.dd 0:HH:mm:ss tt}", DateTime.Now);

                rdr = new MySqlCommand("SELECT lastin FROM login WHERE username='******';", conn).ExecuteReader();
                while (rdr.Read()) {
                    Console.WriteLine("User's last sign in was: " + rdr["lastin"]);
                }
                rdr.Close();

                new MySqlCommand("UPDATE login SET lastin='" + time + "' WHERE username='******';", conn).ExecuteNonQuery();

            }
            Console.WriteLine("HHHHhhhh");

            //TODO:
            //
            //If the username exists, check that the password hash matches.
            //
            //If the username does not exist, be like "No user found".
            //
            //Else, If the password hash matches, Sign in.
            //Set the current player to active
            //forward/bind socket to control an Object?
            //Note the timestamp and IP of the login in the database
            //Send all of the necessary information back to the client:
        }