How to check unique values in datatable?

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I want to validate data table row is unique or not.i finish the validation but the problem is if any empty values in fields throw error message.
How to validate only values.if empty value is occur just ignore it.

What I have tried:

C#

var duplicates1 = dtPart.AsEnumerable().GroupBy(r => r[7]).Where(gr => gr.Count() > 1).ToList();
duplicates1 = dtPart.AsEnumerable().GroupBy(r => r[7]).Where(gr => gr.Count() > 1).ToList();

Posted 7-Oct-16 22:30pm

Raja Ganapathy

Updated 7-Oct-16 23:52pm

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OriginalGriff 8-Oct-16 5:12am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
You need to explain what is in your DT that is giving your problems - we can't look from here!
Use the "Improve question" widget to edit your question and provide better information.

Raja Ganapathy 8-Oct-16 5:59am

Okay sir!

manu_dhobale 8-Oct-16 5:31am

Well don't see any issue, even if there is null or empty value it will work.
please share whats there in your datatable. also share complete error message

Maciej Los 8-Oct-16 5:44am

Does the data type of r[7] field is numeric or string?

Raja Ganapathy 8-Oct-16 5:59am

Numeric

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Maciej Los · Answer 1 · 2016-10-07T23:52:00

Check this:

C#

var duplicates1 = dtPart.AsEnumerable()
     .Where(r => r[7]!=null)
     .GroupBy(r => r[7])
     .Where(gr => gr.Count() > 1)
     .ToList();

or:

C#

var duplicates1 = dtPart.AsEnumerable()
     .Where(r => r.Field<data_type>("FieldName")!=null)
     .GroupBy(r => r.Field<data_type>("FieldName"))
     .Where(gr => gr.Count() > 1)
     .ToList();