Assign Data in Last Column of Each Row of a datatable

Help
1

I Have 6 Columns in CSV file stored in dt table, 7 th Column of CSV is the Output in a Application , want to capture that value and want to keep in the last 7 th column of dt and take the output in new CSV.
Below is what I did our put throwing exception. Please check and correct

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Below Is the exception

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2

Well, you’ll have to show also the details of the exception. I can think of two things: you did not use Add Data Column to add a column to the DataTable so the index 6 is out of range, or ClaimNo is null and the column does not allow null entries.

3

After adding the column name to the datatable.

just take one for loop with the updated datatable and
assign-------row(7)=“your value”
write csv…

for loop end.