Data Table Comparison based on a specific column

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1

Hi all,

I want to compare table 1 with table 2 based on a specific column. Then copy the new data rows available in table 2 to table 1.
i am using below code.
table2.AsEnumerable().Where(function(row)
Not table1.AsEnumerable().Select(function(r) r.Field(Of Int32)(‘Email’)).Any(function(x) x = row.Field(Of Int32)(‘Email’))).CopyToDataTable()

But using this code if there any data in table1 but not in table 2 that is also coming. which should not.
Please help

2

Try for each row in dt2 lookup value on key in dt1, then if condition is/isnot met add data row to dt1.

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3

thanks matt. i just want it via linq code.

4

Are you sure the field “Email” is an integer? That seems strange, I would have expected that to be a string field.

5

you are correct thats wrongly typed. thats string actually.

6

dt2.AsEnumerable().Where(Function(row) Not dt1.AsEnumerable().Select(Function(r) r(“Col1”).toString).Any(Function(x) x = row(“Col1”).toString)).CopyToDataTable()

In this dt1 contains 10 to 14 numbers and dt2 contains 12,15

The Output is 15

7

Thanks @Priyanka_Ramesh for your response. But this is the same code i have written. i am getting rows from dt1 as well. can you please recheck?

8

Hi ,
yes, Can you check in this XAML . I’m not getting dt1 in this.data-table-comparison-based-on-a-specific-column.xaml (9.4 KB)

image

9

Oh sorry its my bad. there is some issue in my data. Code is correct only. Thanks for all your effort.

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