Hi,@jun1.lee . You could try the code below to see if it helps you. For more information, you can refer the solution here.
var res = from row in dt_raw.AsEnumerable()
where (row.Field<string>("A") == "B" ||
row.Field<string>("A") == "C" ||
row.Field<string>("A") == "D"||
row.Field<string>("A") == "E"||
row.Field<string>("A") == "F")
select row;
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