I thought this was called a left outer join but statement is not giving me the correct results
var results = (from rA in dtA.AsEnumerable()
join rB in dtB.AsEnumerable()
on rA.Field<string>(PrimaryKeyName) equals rB.Field<string>(PrimaryKeyName) into joinedRows
from ab in joinedRows.DefaultIfEmpty()
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The email signature template has been downloaded from: