https://learn.microsoft.com/zh-tw/dotnet/api/microsoft.sqlserver.dts.tasks.bulkinserttask.dtsbulkinsert_datafiletype?view=sqlserver-2019
DTSBulkInsert_DataFileType Enum (Microsoft.SqlServer.Dts.Tasks.BulkInsertTask) | Microsoft Learn
Defines the type of file that provides the source data.
enummicrosoftsqlserverdtstasks