Working with NpgsqlConnection
http://www.sqlines.com/postgresql/npgsql_cs_result_sets

 

Copy command (Bulk insert)
http://www.npgsql.org/doc/copy.html

 

Copy command
https://stackoverflow.com/questions/42108766/cant-import-rows-in-pgsql-with-npgsql-in-net-core-app-with-begintextimport-t

 

Using Npgsql and Import (bulk)
https://stackoverflow.com/questions/48467377/npgsql-begintextimport