Getting a count of rows in a datatable that meet certain criteria

Question

I have a datatable, dtFoo, and would like to get a count of the rows that meet a certain criteria.

EDIT: This data is not stored in a database, so using SQL is not an op

Answer 1

int numberOfRecords = 0;

numberOfRecords = dtFoo.Select().Length;

MessageBox.Show(numberOfRecords.ToString());