Compare two DataTables and Display the differences in another datatable in LINQ

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I have two DataTables and I want to display the rows. if both the datatables having the same value, Then mark X in all columns or else select the column with highest value(Eg:DT1: 10,DT2 :5)

Datatable1

id Name Weight
1 Ship 500
2 Train 600
3 Plane 700
4 Car 800
Datatable2

id Name Weight
1 Ship 500
3 Plane 600
4 Car 200
I want the result to be:

Datatable3

id Name Weight Datatable1 Datatable2
1 Ship 500 X X
2 Train 600 X
3 Plane 700 X X
4 Car 800 X
I have tried the below:-

DataTable Datatable3 = (from a in Datatable1.AsEnumerable()
join b in Datatable2.AsEnumerable()
on a["Name"].ToString() equals b["Name"].ToString()
a["Weight"].ToString() equals b["Weight"].ToString() into g
where g.Count() != 1 select a).CopyToDataTable();
dataGrid1.ItemsSource = Datatable3.DefaultView;
Please help me on this. Thanks in advance

Posted 12-Dec-14 2:18am

LAKSHMINARAYANAN E

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Maciej Los · Answer 1 · 2014-12-12T02:33:00

If i understand you well, you need to join data on id, then to compare weights:

C#

DataTable Datatable3 = (from a in Datatable1.AsEnumerable()
    join b in Datatable2.AsEnumerable() on a.id equals b.id
    select new{
        Id = a.id,
        Name = a.Name,
        Weight = a.Weight
        Result = a.Weight == b.Weight ? "x" : ""
        }).CopyToDataTable();

[EDIT]
Ok, try something like this:

C#

var qry = from a in dt1.AsEnumerable() join b in dt2.AsEnumerable() on a.Field<int>("id") equals b.Field<int>("id")
                           select new
                           {
                               Id = a.Field<int>("id"),
                               Name = a.Field<string>("Name"),
                               Weight = a.Field<int>("Weight"),
                               Result = a.Field<int>("Weight") == b.Field<int>("Weight") ? "x" : ""
                           };
foreach(var v in qry)
{
    Console.WriteLine ("{0} {1} {2} {3}", v.Id, v.Name, v.Weight, v.Result );
}