I was asked for an interview to check col1 for a value and replace it with another value in col2, do this with the most optimal way

I have this code as my answer if any know a more optical solution kindly please share
(From d In dt5.AsEnumerable
Let check = d(0).toString.ToUpper.Contains(checkValue)
Let rpl = If(check,replaceWith,d(1))
Let ra = New Object(){d(0),rpl}
Select dt5.Clone.Rows.Add(ra)).copytodatatable()

here checkValue and replaceWith are given as inputdialogue

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