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DataTable table = table1.AsEnumerable().Concat(table2.AsEnumerable()).GroupBy(p => p["c"]).Where(p => p.Count() > 1).SelectMany(p => p).CopyToDataTable();
DataTable dt1 = new DataTable();
DataTable dt2 = new DataTable();
var query = from r1 in dt1.AsEnumerable()
from r2 in dt2.AsEnumerable()
where r1.Field<string>("c") == r2.Field<string>("c")
select r1;