.net - Select rows in dataset table based on other dataset table -

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i have dataset has 2 tables in it. want following (or it) possible , how have correct?

dstabdata.tables("filingtabs").select("fs_id not in (select fsp_fsid parenttabs)")

how reference data other table in same dataset?

ok ok before y'all flame me! ;)

i did more looking around online , found looks stuff need, off read more here:

navigating relationship between tables


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