How to get mismatching rows in two datatables using linq in C#?

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I want to get mismatching rows in two datatables using linq in c#. I am able to get matching rows but not mismatching rows.
My Linq query is as below:

var query = from r1 in dt1.AsEnumerable()
                            join r2 in dt2.AsEnumerable()
                            on r1.Field<string>("ColumnName") equals  r2.Field<string>("ColumnName")
                            
                            select new
                            {
                                ColumnName = r1.Field<string>("ColumnName")

                                //score1 = r1.Field<int>("score"),
                                //score2 = r2.Field<int>("score")
                            };

What I have tried:

var query = from r1 in dt1.AsEnumerable()
                            join r2 in dt2.AsEnumerable()
                            on r1.Field<string>("ColumnName") equals  r2.Field<string>("ColumnName")
                            
                            select new
                            {
                                ColumnName = r1.Field<string>("ColumnName")

                                //score1 = r1.Field<int>("score"),
                                //score2 = r2.Field<int>("score")
                            };

Posted 8-Mar-17 19:42pm

Alex2 101

Updated 2-Aug-21 21:33pm

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Member 15310336 · Answer 1 · 2021-08-02T21:33:00

Will get the records from dt1 which are not exists from dt2

var query = from r1 in dt1.AsEnumerable()
join r2 in dt2.AsEnumerable()
on new { A = r1.Field<string>("ColumnName")} equals
new { A = r2.Field<string>("ColumnName")}
into tempJoin
from leftJoin in tempJoin.DefaultIfEmpty()
where leftJoin == null
select new
{
ColumnName = r1.Field<string>("ColumnName")
};

Jignesh Khant · Answer 2 · 2017-03-08T20:57:00

Solution 1

c# - Compare two DataTables and select the rows that are not present in second table - Stack Overflow[^]

Posted 8-Mar-17 20:57pm

Jignesh Khant