Retrieve serial ID with Npgsql when inserting with ExecuteScalar

Question

I\'m trying to insert a row into a PostgreSQL table with a serial primary key and I need to retrieve this column after it was inserted. I got something like this:

Th

Answer 1

Is that thread safe?
What if another insert happens between your insert and select? Why not use:

INSERT INTO table (fieldnames) VALUES (values) RETURNING idcolumn?