public class Employee

{

public string Name { get; set; }

public decimal Salary { get; set; }

}

IEnumerable employees = ...; //алтернативно IQueryable;

IEnumerable names = employees.Where(e => e.Salary > 1000).Select(e => e.Name);

IEnumerable names2 = from e in employees

where e.Salary > 1000

select e.Name;