var resultingTable1 = from t1 in dtresult.AsEnumerable() join t2 in DB1.AsEnumerable() on new { LoginID = t1.Field<string>("LoginID"), ReportDate = t1.Field<DateTime>("ReportDate") } equals new { LoginID = t2.Field<string>("Login ID"), ReportDate = t2.Field<DateTime>("Login time") } select new { t1, t2 };
t2.Field<DateTime>
var
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