I was referring to  SqlBulkCopy which is part of the System.Data.SqlClient in C#.  I used that a couple of years back, but granted it was with MsSql.  However, I thought I remembered having a similar tool to that back in the Delphi 7 days, I just don't remember if I used it with Firebird or Sql.  If you say FirebirdSql can't handle it, it must have been with MsSql.