How to get duplicate rows from column A and associated with those rows get not-duplicate values from column B

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HI @geetanjali.nerlekar

Try this expression

(From p in DT.Select() where( From q in DT.Select() where q("Column B").Equals(p("Column B")) Select q).ToArray.Count>1 Select p).ToArray.CopyToDataTable()

Have look on the thread