LINQ - How to check and get unmatching row values from tw0 datatable

Hi,

I have two data table and i want to return duplicate rows in second table if any duplicate found for same combination.

if does not match rows then it should return as below

dttable.png
the above example empno and sub1 from TAB1 should check in TAB2.

if both match then no need to worry.

if doesn't match the particular row (101 and A) then we should return rows from TAB2

below is my sample code.

but, it shows some error..

where is problem in my code...?

 foreach (DataRow row in dt1.Rows)
         {
            EmpNo = row["EmpNo"].ToString();
            Sub1 = row["Sub1"].ToString();

            var duplicates = dt2.AsEnumerable()
            .GroupBy(dr => row["EmpNo"].ToString() && row["Sub1"].ToString())
            .Where(g => g.Count() > 1)
            .Select(g => g.First())
            .ToList();

            
         }

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pls. check my code...?
Gani tptTech Lead cum developerAsked:
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NorieAnalyst Assistant Commented:
From the 2 tables you show what would you want to return?
Gani tptTech Lead cum developerAuthor Commented:
i want to compare empno from tab1 to tab2.

if any empno found in tab2 then return corresponding sub1.

if tab1 of sub1 = tab2 of sub1 is equal then doesn't matter.

if tab1 of sub1 = tab2 of sub1 is doesn't equal then return "Subject " + A1" (A1 doesn't match)....
NorieAnalyst Assistant Commented:
Sorry, I don't follow - do you want to return rows that match or rows that don't match?
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Gani tptTech Lead cum developerAuthor Commented:
return don't match rows...
Fernando SotoRetiredCommented:
Hi Ganesh;

The following code snippet should do what you are looking for.
var dups = (from t1 in TAB1.AsEnumerable()
            from t2 in TAB2.AsEnumerable()
            where t1.Field<int>("EmpNo") == t2.Field<int>("EmpNo") && t1.Field<string>("Sub1") != t2.Field<string>("Sub1")
            select t2).ToList();

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Gani tptTech Lead cum developerAuthor Commented:
Yes. Ofcourse it's matching.
Gani tptTech Lead cum developerAuthor Commented:
Yes. it's working...
Fernando SotoRetiredCommented:
Great, have a good day.
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