Suppose you have a DataTable having 100,000 rows and 50 columns. Now you've create array of perticular column values, how will you do that?

object[] arr = Array.ConvertAll<DataRow, object>(dataTable.Select(<criteria if any or leave blank>), (DataRow r) => r[<column-name>]);

dim arr as Object() = Array.ConvertAll(Of DataRow, Object)(dataTable.Select(<criteria if any or leave blank>), Function(r as DataRow) r(<column-name>));