select on dataTable

how can i select some fields from dataTable (in dataSet)
i tried someting like-
ds.Tables(0).Select(String.Format("Field={0}",ColumnName))
but its not working
any idea?
thanks in advanced

You are missing '...'

Code:

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ds.Tables(0).Select(String.Format("Field='{0}'",ColumnName))

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string values in SQL are between apostrophes.